In the demo video (and I'm pretty sure in the rules as well) they state that you can have multiple double trouble events at the same time, including duplicates of the same event (multiple t-rex for example, although I don't think duplicates of named characters makes much sense).
I was thinking that for the Ravenous Beasts, because I want all sorts of random beasts (you mentioned this in one of your videos as well, having giant bugs and things), that maybe the stats get tweaked a bit based on the specific beast.
A matrix for how various AI interact with each other would be great. Like, maybe the Nazi spooks easily and will shoot at the T-Rex if it's within 12" of the Nazi, which would then cause the Rex to always move towards the Nazi.
It'd be interesting to see some other types of Double Trouble events. Maybe if a specific beast enters the game (or if some cataclysmic event happens, aliens, meteors, &c) the two opposing factions have to team up to deal with that event and while the Double Trouble is in play they can't do damage to each other, effectively turning into a co-op game for a turn or two (which could mess with your strategy for meeting win conditions later).
It could potentially be a rare phase in the game, but could be full of potential for experimenting with mechanics.