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VUE 3 is currently scheduled to be released in May. The critical path for us is determined by our grant commitment, since we are a Melon funded project. The features that we have committed implementing for VUE 3 are extensive and require all our focus. What you are asking for is minor, so I am hopeful that we will be able to the "Windows consolidation" portion of our grant. However, I can't promise it.
Given the very limited funding that we have for improving VUE, we do welcome any support and contributions from the community for furthering VUE. If anyone out there has time to implement the mouse scroll feature, we'd be happy to merge it into the core code distribution.
We just talked about this with the colleagues. It turns out that we already have this functionality in VUE. In Windows one needs to hold ALT while using the scroll wheel. On Mac, hold down the COMMAND key.