Any work-arounds for units that don't auto-attack? I noticed that certain unit types for the computer stand around even when being attacked. Ideally, I would like everything to run as normal, just with 2x speed.

I am not too familiar with x2 speed, but I don't think default AI would behave differently from it. Make sure:

1. The computer units are placed/created after the scarab
2. The computer player has vision of its own units
3. The computer units are not owned by players 9+
4. The computer units aren't constantly being ordered or moved
5. The computer is not allied with the aggressor

With what units are you noticing this problem?

It looks like heroes don't respond unless ordered, all other (non-turret) units behave normally. Turret-units have to be ordered. Patrol command seems to freeze up computer units. I think I've resolved the issue, but if anyone would like to post additional information about the p15 scarab effects, please do so.