Is it possible to add character requirements to joining a faction or path, and therefore cause a character to be unable to join, say, the Mages Guild, or the Thieves Guild?
For example, I don't like the idea that my Orc, who has 80 in archery, heavy armor, two-handed, and single handed fighting, but a <18 in all the magic schools, is easily welcomed into the Mage College. Or that he is asked to join the Thieves Guild. It really ruins immersion for me.
Best Answer
Some mods I found that add requirements on factions or guilds, before allowing you to join:
Oblivion
Guild Skill Requirements
Adds skill requirements for the Fighters Guild, Mages Guild, and the Thieves Guild.
Choices and Consequences
Higher Independent Thievery Requirements
Skyrim
College of Winterhold Entry Requirements
Enhanced Skyrim Factions - The Companions Guild
Minimum Skill Requirements For Guild Quests
Thieves Guild Requirements - No Auto Quest Start Brynjolf