I noticed that Space Guy refused to create a Syringe Gun, something that could easily be fixed with the proper modeling and scripting.
I'll volunteer for scripting the gun if someone is kind enough to make one for me.
I have also noticed it's lacking a reloading animation that may be useful. A simple reloading animation at that, just opening the front part off like in TF2.
I am pretty sure Space Guy removed reloading from the demogun for a reason, so Space, please don't hate on me for doing this.