I strongly support at least the first two, coming here to open a thread for the second.
Motivation:
Being able to craft the colored version (not just pipes, but tanks, pumps etc.) from the original version instead of the raw materials, as a consequence it would fit in better with a lot of other mods that e.g. add recipes with these products or adjust the existing ones. Color Coded Pipes would fit into most conceivable mods packs better automatically.
As for request 1: That would be a welcome option to declutter the first page. I already uninstalled Flow Control for that. An option would be to move them to the "Advanced Underground Piping" category/tab from the Advanced Fluid Handling mod.
The third option would be nice as well, but has the lowest priority of all 3 for me personally.