My best success with veggie burgers has been with vital wheat gluten to hold them together. (recipes on bryannaclarkgrogan.com) Egg replacer (as in Ener-G or other brands of starch + gums + leavener) probably isn't necessary for most veggie burgers -- cornstarch would work just as well. Commercial egg replacer is really designed for baking.
If it works for you, though, great!
If it works for you, though, great!