I imagine that if it is possible it is that, you said it in a tone, of: Can you or can you create a Mod that requires you to collect all the rings, instead of collecting all the spheres?
But yes, excuse my ignorance
You mean creating a Lua about it, or some kind of layout for the HUD? With the lua, you are supposed to have friends who can help you in the LUA, and with the design, you can search Google, or support images, or simply do it your way.
Do you count all the Characters * mods * placed in Srb2 MB? If so, they may be:
13-Hexhog (SLW SONIC)