Anyway, someone finally bugged me enough to make a patch to get pgup/down to work... Submitting actual bug upstream (for a real fix) and the workaround here so the current versions work.
Created attachment 45772 [details, diff] Workaround for tkmoo pgup/dn bug
Created attachment 45777 [details, diff] Workaround for tkmoo pgup/dn,ctrl-enter bug Added a third line so Ctrl-Enter also works.
Correction: That's *shift*-enter ;)
patch added to cvs. resync,remerge to get it. Thanks for the bug report.