Love ability to set tank manually, but it resets with every ui reload.
Any way to make it save names forever?

I don't think there should really be any problem with making tank roles persist through a reload or even a complete restart of the client.
But I wouldn't want to make them persist forever, even when outside of a group, because players roles can change and I can see it getting out of hand after a while if the list never clears. So I would still like it to clear when leaving/joining a new group to avoid issues in the future.

edit: The potential issues I can see are pretty much all related to there not being a good way to indicate that a specific player has his role set to tank manually through the UI. If that changes, then maybe they could persist forever.