To change the Raid Leader string to something else go to Extensions / Language Manager, and select Overrides.
Add the text you want to the COM_RAIDPLANNER_RAID_LEADER constant.
What you mean on auto confirm signups?
I’ll check the other 2.
https://github.com/Taracque/RaidPlanner/issues/43
https://github.com/Taracque/RaidPlanner/issues/44