I haven't really tested the FCK editor in the settings area but I'm not having any problems with it anywhere else. What problems are you seeing with it? And where can one find the r.a.d. editor (I'm drawing a blank at the moment).

I downloaded the trial version and can see what you're seeing but I don't have an answer why it isn't working. Part of me wants to say that the problem is with r.a.d. editor because the default textbox and FCK both work BUT r.a.d. works just fine otherwise. Possibly the problem is because Settings inherits ModuleSettingsBase instead of PortalModuleBase. Do you know of another module that has a textbox in the Settings? I'll dig through all the modules I've got to see if I can find another one that uses a textbox in the Settings of the module.