This is good. Let's get it voiced too, but with a cool down if you spam shit. I don't think it should be broken down to only 6 messages, but perhaps 6 messages in a quick menu. Perhaps a dark souls esque combination wheel, where you can select verb then noun (or suitably translateable variations)
#msg
Assist - Player 1 (auto put player name in there)
Attack - ping or map note
Defend - Water
Focus - anti air
Build - Defense (general) / Eruptor, t1 Point Defense (focused)
Unwise (Or idiot, but I like being polite) - strategy.
Assist me/my - Economics
Don't give up - Skeleton
Obviously more complex, but very importantly it's more memeable:
Unwise - Economics
Reclaim - Player 3 (an Ally, he was just doing awful [just an insult, do not actually reclaim allies])
Chain for lulz:
Unwise - Player 3
Attention - Player 3
Reclaim - Player 3
Give up - Skeleton