Need to modify WonderShaper 1.1

["Segree, Gareth" <Gareth.Segree@xxxxxxxxxxxxx>]

Title: Need to modify WonderShaper 1.1

I've been using the wondershaper 1.1 with much success.
My problem is that I want to guarantee bandwidth to mail/VPN & web surfing and make sure that I don't break the existing script.

If not how do I make sure that I can guarantee bandwidth for mail, VPN & web surfing without hurting ftp uploads.

Thanks