I got to page 9 of that thread and realized what was going on.
I had Control Panel Mode set to View and Control Panel Security set to Page Editor. So there was no way for any Registered User to go into Edit mode which your modules require.
After setting the default Control Panel Mode to Edit, the Add Event and Add Group links appeared for Registered Users or any user in the Role I assigned Edit rights to the Modules.
I normally agree with your view of not reinventing the wheel, but when it comes to "Add" rights in modules I do feel a way to control that as part of the module itself and separate from DNN works better some times.
I have not run across any issues yet, but I know that putting the page into Edit can display options in other modules that you don't want Regular users to see. I've used modules that I've had that issue with in the past...granted I no longer use those modules.
Just my two cents.
But all is working now. Thank you for the great modules!