Currently they can change the fstype combo when editpartition is launched from the RAID wizard.
This is not trivial, will defer. The idea was since we're trying to make this easier, since we know they want to make a software RAID partition, don't let them change the fstype combo menu. Its a nice idea but certainyl not necessary for functionality.
Fixed in CVS
Mass-closing lots of old bugs which are in MODIFIED (and thus presumed to be fixed). If any of these are still a problem, please reopen or file a new bug against the release which they're occurring in so they can be properly tracked.