I used to have an addon that would store how the premade battleground raid was setup so when you joined a battleground you could get leader and put everyone in the correct groups with one command. I can't even remember the old addon's name so I know I'm not much help, but does anyone know any such addons from the wowace files?
I'd prefer to use an Ace addon because I can keep it updated easier, but I'll accept any suggestions also. Thanks.
I haven't seen an addon that does this that uses Ace. I used to use Raid Restore - http://wow.curse.com/downloads/details/5359/
I think there may have been some changes in the SwapRaidSubgroup API though as it doesn't always work in combat or on promoted people in the raid (I didn't test it fully, I just know it had some issues), worth trying out though for you as for battlegrounds you would swap before anyone would get into combat, just make sure you're leader when using it.