Not really, think missle sub
And if it were up to me, they'd need more transports. I haven't played in a while, but isn't there only one transport for each race, and all of them are air? It'd be awesome with sub terrainian transports, and water ones.
What'd also be cool (Just kinda thought of this) but if with EVERY unit, you could change like, 3 statistics, say, defense, strength, and stealth. But if you make one higher ther others go lower. I think that'd be cool, think this. Reavers, ones with really strong defense in front, ones with strong strength in back, and ones with really good stealth coming around back. That'd be so awesome

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Missile subs? Yeah, that'd be cool.
Every unit has a set of three stats? Sounds a lot like Warcraft III, but ALL units, not just heroes, have stats. It sounds good in concept, but do you really have to spend tons of time configuring unit stats to your choosing every time you build one?