As a general point, if you put down some reasoning, people are much more likely to take you seriously.
+ Change the Advance Marauder's Chain Lightning attack damage.
What's wrong with it and what are you proposing to change - Buff, Nerf? Damage, Range, Repeat rate, etc? I think its pretty good as it is.
+ Human Painsaw should have a Secondary attack that deals more damage but slower.
Why? All that really matters with psaw is dps and range. Damage and speed of themselves aren't really that significant.
+ Human Pulse Rifle projectile velocity should be slightly faster.
I can see where you're coming from - It might feel nicer to use if it had faster projectiles, but its already a rather powerful weapon. Making it easier to hit with would probably necessitate a damage reduction, otherwise it would become too stong vs aliens. Then it would be less useful against structures, which is one of the really important roles of the pulse. Overall, probably best to leave it.
+ Human Blaster needs to be faster with slightly less damage.
Meh, don't see the point. The blaster is kind of useless, and it seems to be a design decision to make it that way so builders remain as builders. :/
+ Human Chaingun should look like a M134 Minigun with its sounds.
Who cares. Will probably be different in 1.2 anyway.
+ A ammunition pack for non energy weapons should be made
Hrm, not sure. The battpack is one of the advantages of energy weapons over ammo ones, and it adds a bit of interest to things. It would be nice to have more chaingun ammo (I find myself running out on pretty much any s3 excursion), but chainsuits are already pretty strong.
+ Jetpacks should have a maximum flight time and needs to be turned off to recharge.
Nah. Jetcampers are less of a problem than people think. They're only really an issue if the mapper has been a bit incompetent.
+ Alien dretch needs more health maybe 27 or 28.
Matter of debate. Having 27 or 28 hp would look a bit daft though, needs to be a nice round number.

+ Alien Barricade structure should be removed and a more useful structure should be made.
No. Barricades are useful, especially at s1.
+ Hitboxes need to be improved.
Again, please expand on what you mean by "improved"
+ Graphics/looks of the human weapons, structure and player models should be further improved.
+ Graphics/looks of the alien player models and structures should be further improved.
That will happen on Thursday. I'm perfectly happy with how they look anyway.
+ A grenade launcher gun should be made.
Probably a bit too much. Being able to send multiple nades into an alien base would be highly destructive. Even if it replaced the normal nade, and you could only use it as a main weapon (leaving you very open to being killed by aliens), I still think it sounds a bit strong. Interesting idea though.
Bear in mind the regular nade is the only weapon in the game you have to buy on a 1 by 1 basis. They're like that to limit the destructive power they have.
+ a Advance tyrant should be made that could shoot corrosive acid.
Entertaining, but no.
+ Force fields should be made as a protective barrier against chain lightning and barbs.
No. Depriving aliens of some of their best tools against the human base would be a very bad thing to do balancewise.
Also, look up TremX/korx. I think you might like it.