Not only a great idea, but something that's on our Stuff to Ponder list even now! 
Tactics Trainer Failures...
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Dec 2, 2010
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#2
Dec 2, 2010
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#3
That's awesome. I have actually been seeing a number of the puzzles I miss come back around in very shortly afterwards but having something that would also be great. Of course, that would just give me a chance to drop my rating even more 
; at least until I had those patterns ingrained.
I agree; this is definitely a winning idea. I like it when the problem immediately comes up again, and I would like it to also come up again after some time & effort has passed. I expect this would aid my ability to recognize the patterns.
Dec 12, 2010
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#6
Yes, this was also brought up here:
http://www.chess.com/forum/view/suggestions/suggestion-for-tactics-trainer?ncc=5#first_new_comment
I think it's a great idea.
Did this actually shift from the Stuff to Ponder list towards any implementation? Would be a great feature to have.
Jan 8, 2014
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#9
I think that this is a good idea. Here is another minor issue. Some may be fine but I find this bothersome.
When a pawn is promoted the box offering the choice of peices displays over the action on the board. If I haven't memorized the positon I may not know which peice to promote to, especially if underpromotion to a knight is needed.
I'd find a feature that stored all of the tactical problems that I failed on first attempt very useful. So that I could just spam through a few hundred problems and then go back and focus on the failures at a later time. I realise that this is possible at the moment using the recent problems list but this usually only imprints the idea in my short term memory. It would be sweet to return to the problem a few weeks later and then again as many times as needed to memorise the pattern (without going through 35k problems, of course). Thanks!