In Plus! prefs we have an option to enable the debugger window, which if unchecked basically removes everything to do with debugging that a "normal user" does not need/want to see. How about an option similar to this, where if it was enabled you would get "advanced importing options" (a simple checkbox on the script import window perhaps?)
It's only one extra click when importing, can be saved on a per user basis and only those who enable the option would see it. "Normal users" would just get the window as it is now....
Just a thought