So, I've been working around this issue for a long time but now I really need a way to make this work properly since it's taking certain functions from my reach.
I use a magic mouse from Apple, and have both the 3 button emulation and 3D view presets corrected in User Preferences. However, when it comes to actually needing to scroll the wheel as a means for numeric selection, it simply doesn't work. For instance, after click ctrl+b (bevel) and potentially using the wheel to set the number of segments. Same thing happens with creating loopcuts for example.
I find it so strange that I couldn't find anyone referring to this problem but I'm hoping there's a quick solution out there and this is very frustating since in the case of bevelling I can't even find a keyboard alternative.