I have a few ideas...
NIGHT/DAY VISION GOGGLES
these would decrease or increas the darkness, lighting, color correction in fact everything to do with lighting in the level! only the sliders would be different when tweaking. they're in the middle in the first place. that is the current lighting while the sackboy runs over the enchancements. left is DECREASE and right is INCREASE! So for example if it's pure darkness and yo u nudge the slider all the way to the right then it'll be pure... brightness? but if you nudge it to the left nothing will happen since it's already at it's darkest.
WATER GUN
like the paintinator but with each shot the water level increases slightly. in the tweak menu you have a slider to decide how much you want to increase each shot and also that... thing that changes the amount of times it can be shot. unlike the paintinator it cam be carried in water... WITH SCUBA GEAR ON!
THE GRABBER
This can change which materials you can grab! it appears as a robotic arm and in the tweak menu you can deicde which materials you can grab and which you can't.
WHEELCHAIR
with this you can go across all lethalized(except gas)objects for a certain amount of time. again, tweak menu. determines the amount of time you have on lethalized objects and how fast it is.
HAND EXPLOSIVE
if you pick this up it appears as a bag. if you hold R1 down then a little cursor appears. you can move it to aim and bring it nearer to the sackboy for less power in the throw and further away for more power. once it impacts with something it explodes. tweak menu: explosion size and ammo.
THE LIGHTER
allows you to set anything near to sackboy(EVEN THE FLOOR) on fire. just hold R1 to get a cursor which can select anything near sackboy and BOOM! it's on fire! it could really at to the competitive side of levels.
hope you can include some of these in the first post! thanks!(sorry for typos)

