you need 300 bpm for finer resoluiton, and you ask for quantize 1/4 ? you are one of too many using the wrong gear. all these features you ask for repeatedly are best done with a pc and software. but you probably thing that an mpc look much cooler than a pc.
you could have proposed 1/96 (or better 1/64 first), which would have been actually more useful than 1/4.
but what you could have realized (if you were thinking a bit), is that there are no more F keys available to add more quantize options.
do yourself a favour, buy a pc. all your wishes will come true. (and yes, a pc can be a musical instrument). and you will still be able to play "improvised music" (whatever that mean).
I am also coming ti MPC from the computer DAW based environment and a giggin jazz Saxplayer, u play few other instruments ( piano, bass, flute, clarinet)
I use laptops on stage for triggering samples and seqences...
but would like to add MPC to this setup for it's sound, reliability, tactile vibe.etc,etc
at the moment MPC1000 OSjj 4.99 is in the learning process,
to explore what I can do and what I can't ...
So I do second the previous post, with one addition ...
Is there a feature on any JJ OS to play some sequence or song
and sample ( short) yourself playing an instrument or sing on top of that
in real time like a cycle recording in Logic Audio or something like
recording an audio loop without stopping just like you can do with the drum tracks ?