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In regards to binding +jump to mwheelup, I just find that awkward an uncomfortable. I'd sooner use mouse2, but my heart truly lies with spacebar.
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I prefer the mouse wheel in Portal 2 because it frees my left hand alot more for movement, but it's easier to land a consecutive jump. The problem with this is I have +use bound to mwheeldown for when I want to actually hit a button or grab something from a weird angle or through walls (since mashing E can be a bit unreliable at times).
If you look in the video I posted, you'll notice it took around 10 minutes to finally get the jump to work correctly in the second chamber (Buttons); the gap is rather annoying to jump as you have to press the button as well...it'd probably be easier with space bar but I'm too used to the mousewheel now. You used to be able to bind +use and +jump to the same button but I wouldn't do that, too many instances where it's not useful and it's kinda annoying.
Anyway this video will show some glitches with funnels (harder ones to perform):