extensions storage location (Windows)

[Maris]

In Windows, the python search path is apparently restricted to  
library.zip, which makes adding extensions a bit complicated, but more  
important: they are lost upon mercurial updates. This can be overcome by  
specifiying absolute paths in mercurial.ini, which is not that elegant,  
too.
In Linux, however, the search path points to a normal directory.

Am I missing some undocumented feature?

-Rob