Vista - Disable UAC prompts for *specific* applications

Short of using TweakUAC, is there a way to selectively turn off the
UAC elevation prompts **specifically** for a given application?


Our application is going to run under an account that will have both
standard and admin access privileges. There may be situations when
the Vista box may undergo an unattended reboot. When the machine
comes back on:


* How does one log a user back in transparently without any manual
intervention?
* After such login in complete a Start menu script will launch our
application but since it will be unattended there will be no one to
consent to the elevation prompt. Is there a way to avoid popping it
for our application alone?


I read somewhere that signing an executable can allow Vista to
elevate
its privileges silently. Is that what I should be doing?


thanks for any inputs.