Assuming for the now that the Chain system stays, I feel we need a toggle (located where the Group commands are).
1. Follow Leader Only - The chained characters always follow the "leader" (character in position 1 of the chain), but move/act independantly if selected (i.e. the leader doesn't move if I select any other character and move them). Unchained characters do nothing if leader moves as is the case now.
2. Follow selected - As is now, if I select any character within the chain and move them, they become the defacto leader at that moment and all chained characters follow.
3. Independent - Chained group can still be given group commands (like Stealth), but no one follows anyone.
4. Unchain group - as is now.
Even with that, I still want a left click drag and select option in case I want to quickly move 2 or 3 of the party (perhaps later more with companions and pets).