Mmm, maybe activate proper touchpad gestures, like 2-finger pinch zoom?
Ah, yes. I think I misjudged your problem. You want ctrl+scroll to not zoom in the browser? How about custom keyboard hooks on system level? (Now I'm getting ridiculous - I know ;P)
#thanks for the hint! just disabled it by setting #mousewheel.with_control.action to 0 in #about:config
(0 means "Do nothing", 1 means "Scroll contents", 2 means "Go back or forward in the history", 3 means "Zoom in or out the contents")
This should do the trick for me, as I somehow only experience this problem in #firefox..!?
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