Ok, I want Rose of Sharon Cassidy to be my official Follower for this Play-Through. Lore wise is that Sharon and Alexandria (my character) long time friends and would travel the Wasteland forever together. Alexandria decides to take a quick and easy courier job, while Sharon gets her caravan ready for the walk around New Vegas. You know how it starts...

The point is, how do I do the other companion quests without actually doing the companion quests?

If it helps I'm playing on the PC.