Quote: "3: Better/standalone multiplayer (I think TGC have already hinted at this with their Christmas update, so I'm really excited to see what exactly they do! I would especially love to be able to add Co-Op, so you can play through a campaign level with 2 or more players )"
It's not just a hint, we're getting w hole new multiplayer system which uses a third party system to host game.
Quote: "4: Carry weapons/ammo between levels (You could probably do this via scripting, but it would be nice to have it as a built-in feature )"
Weapons and ammo between levels is already in and default, in fact a command was added recently so that if ammo and weapons being carried over isn't wanted they could run the command to clear out the weapons and ammo.
Quote: "6: For something like AmenMoses' particle tester to become an official feature! (Seriously, that thing is so useful, I'm surprised that GG doesn't have any kind of built-in visual particle editor!)"
It is, or at least it should be from what i heard.
i7 7700,k NV1070 8GB, 16GB 3200mhz memory, 1x 2TB Hybrid, Win10.
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i5, NV1050 4GB, 8GB memory, 1x 1TB HDD, Win10.
i3, Intel 4000 series graphics, 6GB memory, 1x 500gb HDD, Win8.1.