[plt-scheme] Two short questions

I have two questions about DrScheme:

1. Is there any init file to be read by DrScheme (like for MzS and MrEd).
   I need it mostly to conditionally set directory name of local 
   collections, useful e.g. during version change?

2. Check-syntax button does not like opt-lambda with rest parameter, e.g.

   (require (lib "etc.ss"))

   ...

     (opt-lambda (a (b 1) . c)
   ...

complaining about it to be invalid.  Of course other tools accept it.
Is it an error?

Zbyszek Jurkiewicz