Suggestion for QProcess, running processes under a different user

It would be nice to have the following functionality in Qt in a platform independent manner.

1) - The ability to run a process as a named user (plus password). When having
a service that needs to run another program as a named user, the
service knows the users login name and password, so at the moment it is possible call
a windows api's (LogonUser, LoadUserProfile,
ImpersonateLoggedOnUser, CreateEnvironmentBlock, CreateProcessAsUserA).
It would be nice if I could simply use a QProcess to do this.

2) - Enable QProcess to make use of Vista UAC prompts when running a
program that requires elevation to administrator. I have currently coded
this using the windows api ShellExecute, which propmts for permission
to run the process elevated.