Thanks for that info. Alas, the version of gmenunext above does not have OPK support and seems not to be completely set up for GCW0: defining TARGET_GCW0 doesn't actually do anything other than set the correct path in /sys/blah/blah.... for the battery status..
The only feature I miss in GCW0's old gmenu2x is remembering the last played ROM. I'll have to hunt around to find which of the many gmenu forks has this feature and OPK support. I think the one in retrofw 2.2 does, but I can't find the source code.