The UI for Ableton Live Lite does not take mouse scroll wheel actions. Also, the fader knobs not work with the up/down arrows.
Please consider the benefit of adding scrolling to these objects on your forms. It would mean a lot more capability to sit back and edit. I would prefer to close my eyes and listen, turning a scroll wheel or up/down arrows on tempo, and knobs. Less to focus on means more listening. More listening means a "better" mix by getting to the result easier/faster. Seems like that would very much help you sell Ableton Live and encourage adoption by more users.
Tracktion does this already, as does Cubase.
Thank You,
SHD