You're right, they don't read your post.
Your only concern should be to provide enough comfortable places for alien structures. Make sure alien buildings can't be bombarded with no risk, and from afar. Aliens certainly can fight in open areas, it's the base defence that can be hard with open spaces.
I don't remember humans winning transit map. The reasons are:
- having jetpack doesn't really make you deal more damage, and often makes you deal less (even more time to dodge lucifer and pulse; shotgun, chaingun, machinegun lose a lot of damage because of spread). I played my share of games and I have yet to see game-winning use of Mass Driver. Some people have good aim and ping, but it still takes a few shots to take many aliens down, they're fast and they regenerate. Mass driver clip without battery pack is limited, and you run out of ammo quickly unless your aim is very good. Most people don't have _very_ good aim.
- there are enough places on Transit to hide alien buildings, as opposed to human buildings, and travel distances are big. When several marines go outside of the base, it doesn't take much effort to destroy undefended base.
Marauders are probably the best alien for open spaces.
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I don't like your idea of changing jetpack because of other reasons. It would make jetpack more powerful, because out of sudden it would become a combat item. It would be possible to dodge a tyrant or dragoon.
At the moment the main downside of jetpack is that it's very slow, several times slower than most aliens. You can't chase anyone with jetpack. When you see marauder flying at you and about to zap, it's probably too late. You can't react quickly.