Re: chart group
1.You can't change the name as such so it's a question of delete and create a new group with the correct name.
2.You can't change the order. Delete all groups and recreate them in the correct order.
I use chart groups a lot, and the lack of these features does not bother me to much, but that's me.
There is obviously a lot of space for development here......to make this feature more in line with user expectations.