permissions to use smart --gui

Hi I've started to use smart instead of apt recently and i have a problem. Smart works great from console with sudo but when i try to run it with --gui option i get "permission denied" on every rpm operation (under unprivileged user) or "RuntimeError: could not open display" when i start it with sudo. I think i can make smart suid but this will result in a possible security hole. Is there a more gentle way? Thank you S. Cherepanov