Is there SOME mod, that alters the quests letting you join a DIFFERENT faction /and/or that lets you fight against both sides? I feel forced to roleplay as a villain by choosing one of these two factions, and I don't want to roleplay as a villainous character my first playthrough through Skyrim, as I generally play a villainous character through a second playthrough.

If you know if mods that do this, can you please list them here?

Well there is a mod to make your dragonborn High king.

If that is cool with you, I'll link it.

I was hoping there'd be a lot of mods that alter questlines more, but still I'm interested, can you please link it?