Yes I have looked at those posts and the scripting seemed to be beyond my comfort level. Please consider this as a feature request - to be able to select the VPN and interface routing through a menu.No. You would have to implement it manually through scripting. I believe there's a few forum posts discussing this.

Welcome To SNBForums
SNBForums is a community for anyone who wants to learn about or discuss the latest in wireless routers, network storage and the ins and outs of building and maintaining a small network.
If you'd like to post a question, simply register and have at it!
While you're at it, please check out SmallNetBuilder for product reviews and our famous Router Charts, Ranker and plenty more!