As in making groups for soldiers that are not a, b, c, d, e
Not even custom ones are required, but I would very much like that. There is a button to already diversify them by type- but grouping them up into sections would also be good. Like 'Assault Squad', 'Defense Squad', or 'Squad 1' or something like that.
Basically anything that lets you take a mix of troops, and be able to assign them to others, or set as militia, without hunting them down in the list.
Personally, ultimately I'd like to see custom groups that have their own event list, aggregated from the soldiers inside it, dead and alive, with a few more data points to observe. Losses taken in battle, kills, wounds, equipment loss, etc.
But for now, like what you did with character grouping, it would be nice if we could get, or replace some of the letter groups, with more meaningful ones.