Hi artzien,
personally, I would just turn down the volume of the signal before it enters the mixer. This is easily done using a gainer, or on the post-mixer device - you really think that warrants a special type of track?
As for (2), this has been suggested and considered as a native feature in Renoise
https://forum.renoise.com/t/transpose-scale-presets/40091
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But then you just reminded me of a slightly different concept/idea… It revolves around the idea that sometimes, your songs grow to become very complex. Not only with many tracks, but also parameters that are inter-connected, modulate each other in various ways…
So the idea was to introduce a separate tab (like “Edit” and “Mix”) that would allow you to easily group together all these “logical” elements, and visually organize them in their own separate space without actually changing the layout of the song in any way.