Problem in making Cards [when learning a foreign language.]
When adding or editing a card, we switch from Foreign to Native language many times -- while 'optimizing' the card.
Multiple switching takes time.
Suggestion:
Assign a Foreign language [user chooses it in Settings] to the Front side of Cards.
That way, as one 'clicks' on the Front side - the Foreign language is activated.
Should work in the Browser, too.

Working with flashcards featuring a lot of pictures, it would be nice to have an option for turning on an immediate preview of images while the user is still in the "edit card" tab.So no need for pressing "preview" as in preview mode of course you cannot work on the possible text you want to wrtie below your images.

Support for using already existing cloud services (dropbox, google drive ...). Then both computers don't have to be online when syncing, and you'll never have to think of syncing manually.

Perhaps it could build upon the existing sync. function in mnemosyne, instead of syncing directly to another computer, pull the data from an folder. Check the folder each time mnemosyne starts, update the folder when mnemosyne quits.

In may 2012 David Haas suggested to have Ctrl+B functionality for bold text.
SInce he did not put it in, as Peter advised, I'm doing it - bcs I need it for EVERY english vocab card.
Meanwhile, I will try to lear how to make keyboard macro, as David mentioned.

Currently it is only possible to view grades for one single sub topic at a time which does not really give you a good idea of how you are progressing. Also it could take you a long time to view all your grades; if like me you have lots of topics and subtopics.

I think it would be useful to be able to see the grades of 'active cards only'. This way you can see how you are progressing on those cards which you are working on right now.

Microsoft Office OneNote allows Screen Clipping by Win+S to take a screenshot of a certain section of your screen.
Please make it so that Mnemosyne can paste images from the screen clippings copied in the clipboard

I need to add sound to many cards, and I can do it by find and replacing some words to add the path of the sound files to the cards. Also I did some mistake in writing punctuations which I could correct all of them by find and replace. Right now I can't do it by exporting the database to another text editor because on import my learning process will be lost.

Add an option to never show the warning about learning 15 cards in a day.

I'm using the cram scheduler to review about 500 drug details. I find that assigning a number (0-5) slows the process. I just need a right or wrong and move to the next. If only there was a tool that allowed me to focus on particular cards that had the most thinking time. Donation incentive :)

Now, we have to move the bar manually

It would be really helpful if it supported Office 2010/2013 clipboard information. So that it would retain bold/italics/font size/etc.

One step further would be to also detect and store font styles that would be usable throughout the database.

For Example:
I have a very large microsoft word document that is using font styles for every component of my norwegian notes.

The reason why I used this system is so that when I want to make a change to several thousand vocabulary words formatting I can do it by just adjusting the style profile.

There are a lot of card-sets offered here of them a lot with sound:
http://www.byki.com/

To import the files from there would be great!

Suppose an English learner was learning the word "toothbrush". It would be facilitate learning if this vocabulary item could be left pending until both "tooth" and "brush" had already been learned.

When you review a difficult card, with this skip the card option, you skip it temporarily, not let it block the way to review other cards, just as you can skip some tricky questions in an exam and go back later.
In my experience, thinking of the answer of a difficult card is time-consuming. But if we can skip it and go back later, the answer usually spring up, due to our magical brains in recalling.
The function has been implemented on Mnemododo. Why not implement it on Mnemosyne 2.x?

Latex and HTML code should have a different color than normal text. That way it would be much more readable.

I just found out about a feature, which I wanted to suggest. ^^ Ctrl+Tab indents text in the edit window.
Indenting multiple lines of text, could be nice feature. For example: select some lines and then use Ctrl+Tab to indent all selected lines. Well, this feature, will probably not be added before mnemosyne 20.1, but maybe the devellopers will get bored one day. ;)

My language cards use Front-to-Back, Front-to-Back-&-Back-to-Front, Cloze Deletion types (I don't use Vocabulary type). It is helpful to use a different background color for each language so they are readily distinguishable (e.g. light red for Indonesian, light blue for English, etc.) But that requires a clone of each of the three above card types for each language. It would be much easier if I could set a background color which would apply, for example, to any Indonesian card, regardless of the card type.