Startup key combinations with bluetooth keyboard?

In Lion, accessing the recovery partition entails holding down the command-R key combination at startup. Selecting a startup disk and starting up in Safe Boot mode also require holding key combinations at startup.

But under Lion and a bluetooth keyboard, none of these key combinations work. A wired keyboard works fine, but I no longer have one.

A friend who downloaded and installed Lion today just called and asked how he can do this with HIS bluetooth keyboard, so this seems to be a general concern.

Any tips? Thanks!