With the amount of companions we can have at this point it would be really sweet to have some kind of way to put companions on a favourite list to find the right companion easier when you are going to summon them, the current way its handled is very frustrating when you do content that removes your summoned companion when you use a lift, like Star Fortress, and when you want to find your main healer, dps or tank companion.
If a favourite list cant be made, you could put every companion into the same category and have them sort after companion level.
EDIT: I also posted this at the SWTOR reddit, link:
