No, but:
2 - in the overview in the smartphone app (More → Logic) the variables are sorted alphabetically, probably also numerically.
3 - maybe it helps to use an own system, e.g. B_ for boolean, N_ for numeric and S_ for variables with strings, or the name of the room, or something similar…
4 - there is a search function.
5 - please see point 1.
7 - Unfortunately, the name of the variables are only partially automatically updated. Variables inserted via tags are automatically updated. Variables inserted via dropdown are not automatically updated. You have to update them manually in the flows.
Maybe it can be done via a homey script, but I don’t know.
8 - please see point 1.
Seems like the variable name problem is still not solved. We really need to be careful when choosing variable names, since it gets very messy if a name is changed. We could say it’s nice that the flows still work after the rename, but I would really love an update where I got a mark or error sign on the flows using an old variable name.