My honest opinion on this..., if you really want to get your rhythm in check--learn to play the drums, and learn to play "rhythm guitar". Being able to do both of these things has helped me SO MUCH with my piano and keyboard playing.

I truly think that taking the time to learn these two areas outside of keyboarding, and piano playing will make you stronger in the ryhthm department. Once you get a good handle on them, you'll start to pick out rhythm and timing issues in either your own work and others.

Squeak