A few of us have played Metal Fatigue. But, I'm not sure there's any specific influence from there in Servo. Similarities will exist given giant robots and all, but there wasn't any intention to make an homage.
On the weapon mix and matching... We have it restricted right now for a couple of reasons.
1. It helps you make choices and investments. You end up giving your Servos more of a unique role this way. If every Servo can do everything, that has been less fun in our testing. We've found it also helps recognition in multiplayer. When you see someone roll in with swords, you know enough about what that Servo can do. But, this is a hotly debated issue, so we're interested in thoughts there.
2. We haven't found any good solutions to the problems created by wielding items of multiple types in the common RTS control scheme. Right hand is currently dominant. So, we use that to decide ranges and whatnot when you right click on a target (you can turn on the automatic commands and be super explicit, but few do that). Anyhow, let's say that you have a sword in your right hand and a gun in your left hand... When you right click on a unit, you'd then close to melee range so you can swing that sword. Fine. But, what happens when that unit runs away from you? Do you chase it directly to keep the sword in range or do you stop to fire your pistol?
We are traditionally not fans of trying to guess what the user wants us to do. We want something very clear.
It's often suggested that the offhand pistol can be shooting while you're closing to melee range. True. That's reasonable. When we flip it around, though, it's not so clear. If I have a pistol in main and sword in off, when am I going to use the sword in that model? Probably when you've closed on me and I'm in melee range. Is that enough? Would you ever choose that? Our fear was that it wasn't useful enough.
But, that's why we're doing this. To get feedback. Tell us what you think. We've have a simpler, but restrictive system in place now. We can experiment with more flexibility, but it does complicate things.
Oh, and you can put some other stuff in that left hand. The deflector/riot shields, for example.