A new CVS build is available from:
There is a speedup commit from alien-xmp (and some other gameengine related commits).
To get the Actor button: set physics to Sumo in the world material settings.
I can't launch this build. Blender complains about some missing libs (openAL and some others). 2.32 works fine on my system (slackware 9.0)
I've had the same problem, I had to install the libopenal0 package (easy on a debian system, but I'm sure some googling will help), it's some kind of a 3d sound library as I understand.
Yah, you need to install OpenAL. Sorry, forgot to mention that :]