Humans:
Do the medkit and medistation effects stack?
Aliens:
Do you attack faster if you mash the fire button as opposed to just holding it down?
You wouldn't, by any chance, have to aim at the sides for some aliens? Cause, well, the aliens have claws out to the side (see my logic there

) and more to the point I've managed to hit people when they're just off the side of my screen - although that could just be attributed to lag.
Dretch:
When attacking buildings is being in contact enough, or do you have to back off and run forward again to keep "smacking" it?
Lisk:
What are the constraints on grabbing humans? Can you grab them in mid-air? From a wall? If no, what about from the floor if you left wall-walk on? Do you have to sit still or can you circle around them without them getting loose? Is there anything humans can do to prevent being grabbed in the first place - such as jumping, sprinting or jetting?
Goon:
How does the pounce kill people? Do you have to hit the human mid-flight?