I would like to get the following custom rom:
based on gingerbread 2.3.3
include openvpn + gui for easy configuration and certificates upload and management
tweak for the framework to allow the native sip calling over 3g/hsdpa/etc.
add g729 codec
tweak kernel for performance and smooth gui operations. (need to make sure battery usage is fair).
remove all stock apps and leave only related app for tweaking and openvpn management.
full source code.