Good topic, mLy!
At least the idea to get all your ideas together in one place to make them easier to find when someone will decide to do some improvements to the game (seems we already have a new coder, so the time is proper).
But I want to ask you to edit your first post in this topic to keep it up-to-date with your current suggestions/doubts. It is not because I'm lazy to read whole topic each time - it's because not everyone is so patient
Actually, the best place for such suggestions is bug tracker as well as for bugs, but the community is too small to start to use it.
And actually I don't have much to say about your ideas..
As mine you may take the following one - I would like to see akimo and separate pistols in 3 different gun slots. Like whe I press "1" I get first pistol, "2" I get second and "3" I get akimo mode of both. It will make easier to switch between them to me. At a particualr moment of the game I may have 6(7?) different weapon choices maximum, so I would like to have a key for each.
Hitboxes and hitzones is hard work to fix.. But others (like reducing/increasing cost, rate, firepower) are easy to implement, so keep them up-to-date and soon we may get a fix for them.