Suggestion: Add MA to autofill on archer worlds, for the "additional attack" option. Reason, it's an offensive unite and not a defensive unite, so it should be included just like axes and lc.
Thought about it one more time and maybe you could even go as far as to make us able to choose any units, since you sometimes send trains from def villas or want to use scouts. Would make those situations smoother too.
Suggestion 1: Make MA autofill for "add additional attack".
Suggestion 2: Make all unites selectable (and saves it for next time, just like it remember cat targets next time you send). Would look like this: