Has anyone written a MIDI file tutor-izer?

Dear MIDI-Perl users,

I'm looking to improve my keyboard skills by learning to play
songs from MIDI files I've downloaded from the Web. I can read
standard music notation (although not nearly in real time, if 
the song is difficult), but the sequencer I use (MOTU's FreeStyle)
does a rather poor job of generating notation for tracks that contain
grace notes, notes that don't fit standard beat divisions, or other 
common playing techniques. FreeStyle shows what's really in a track 
if I use the "graphical editing" view (a piano roll display), but 
I find the piano roll much harder to read than notation. 

I can figure out difficult passages more easily by playing them back
through my Casio CTK-620L, a consumer keyboard I bought solely to 
get its "key lighting" system. (The keys on its keyboard light up
to show incoming note events on MIDI channel 4 (which I guess is
really MIDI channel 3). It's about as good as having a human 
teacher right there to show you what to play.)

The problem is that FreeStyle lacks the features I need to play a
song back in a "learnable" way. FreeStyle just wants to play a song
from beginning to end. I'm not Mozart, so that's usually way too
much to digest at once. To learn a song, I need to divide the song
into phrases, select a phrase to learn, and loop it repeatedly, 
perhaps with a countoff measure between repetitions (to avoid the
nonmusical "glitch" one might get from running the end of
a phrase directly into what may be the musically unrelated beginning).
I might also want to interleave a long rest between repetitions 
of the phrase, to allow me time to try to play the phrase by 
myself (rather than along with the sequencer).

The only way I know to set this up in FreeStyle is by doing a
massive copy and paste operation, where I copy phrases out of a track
and paste them repeatedly into an empty track. This would be
tedious to do for one song, let alone a whole repertoire.

Obviously this would be straightforward to do with MIDI-Perl:
read a MIDI file and copy phrases out of a track into another
track, according to whatever repeat-count and spacing scheme
I specify in some data structure, and then write a new MIDI file
containing a "tutor-ized" version of the song. I could also
specify a tempo map, for example so the first repetition of 
a phrase is half speed or less, and later repetitions come up
to full speed.

I'm pretty sure I can do this with no problem, but I was wondering
if anybody else has already done this. On the flip side, if 
nobody else has done this and anybody else is interested in what
I come up with, I can post it here.

-- Daniel Mocsny