Are they Apple's problems, or Palm's?
It depends upon which issue you are talking about. If you are referring to the lack of category and location support, those are long standing issues with the iSync Palm Conduit, and I think it is reasonable to say that the will never be 'fixed' by Apple. Support for the features of 'advanced' post-Palm OS 5.4 devices is available from Mark/Space in their
Missing Sync for Palm OS package.
Events created on your Palm device will always end up in a single designated calendar, in iCal: by default, that is the Unfiled calendar. There is nothing you can do about that behavior except, again, switch to the Missing Sync for Palm OS. That's just the way the iSync Palm Conduit works. So, there in not going to be a 'fix' offered for that issue either.
The first issue you mentioned appears to be a bug in iSync 3, and will be addressed. When? There is no information regarding a due date for resolution of this issue.