Left click for left arm, right click for right arm, and another button for the LPLs. Not very hot, but it does the job. Only did one drop (then back to the ones I was already working on), but 3 kills.
I really like the idea of the build. Plus running XL on a Crab is not so stupid since it has such a huge CT. The Crab really feels hard to build properly, STD gives tonnage issues and XL gives slots issues. Here is how I'd run your build. I feel like some SRM's give more utility than an AMS.
I was running like this last night (different ammo load) and was demolishing. I loved it. I thought the MGs were silly on a Crab, but, with that much firepower tearing off armor, it works.
I think 6 MGs would be kind of ridiculous in this variant, because otherwise your firepower would be something like 2xSRM6 and 2xLPL (or similar) which is kind of a waste on an Assault. However, 4xMGs backing up AC10s or LBX10s are a nice addition. I normally don't like having weapons of vastly different ranges grouped together unless it's an alpha group (i.e. I wouldn't want to group an ER LL with a SPL), but the machine guns have enough ammo and 0 heat generation that I'm fine with running them on the same group as the LBX.
