Thanks for your efforts, just for your interest: It is possible to run Firefox10 (and may be even more apps) from oneiric on the n900 with nemo installed, i guess there are issues with dbus which cause some crashes. May be the buggy thumb was fixed in the Meego-Kernel, so i will make further investigations if it's possible to use up2date-debapps on the n900... Should be interesting for the nemo-team anyway!
Update: Audacity1.3.13-beta is able to record and play