It really depends on the situation for me. I think that if a fascist/OOC bad region has a:
1. reasonable chance of the founder ceasing to exist and not returning before an operation can be completed,
2. reasonable chance of the region being passworded in the near future,
3.the region does not have an enormous amount of influence (the stat) that would take eons to kick even with a sleeper.
If a region does not have the above, I will be against. All of the current 'preemptive liberations' are crap, and they only serve to give attention to these regions. It is a misuse of mechanics. But if my criterion is satisfied, it's fair game. Bash the fash.
Very little. I think like whip up a proposal in a few minutes, send it to a few friends for peer review, then submit asap. It is a sprint and not a marathon in this case, because any time squandered is time for raiders to destroy a region/fascists to protect their region.