I do not own a PSR 9000, but I have used PSR 510. If the OS is similar (the way YAMAHA do it) it might work for you.
Hit the crash toward the end of the fill; i.e. wait past the last beat of the measure and hit the crash a split second before the first beat of the fill. Then quantize. (I do this before recording the instruments that should not be quantized.) The quantization process will move the hit toward the first beat but from behind and hence it won't be played until the end of the measure.
The two diagrams shows what happens when you hit the crash just before and just after the 1st beat. Though they end up on the same beat, depending on the OS design, they might behave differently.
(HTML screwed up the diagram and I deleted it. I'll try to email that to you)
Hope this will work on your PSR too.
Shiral
[This message has been edited by shiral (edited 01-31-2002).]
[This message has been edited by shiral (edited 01-31-2002).]
[This message has been edited by shiral (edited 01-31-2002).]