Actually, Mikkel, ventrilo is definitely a requirement to be able to admin effectively. So it is in your best interest to install and use ventrilo if you are looking for a promotion. Remember, being active not just in game, and forums, but also in ventrilo will help make you stand out and have leadership notice you as being active. It's a lot easier for me to remember a member if I was to talk to them while I'm in game, having both visual and hearing memories when I review members up for promotion.
If you're having issues with ventrilo, please post up in the Tech Help section with any screenshots of the problems you're experiencing, and we can try to help you.