• I seem to recall that Proto pilots burned out/died quickly esp early on when they first came out. Was this issue resolved or improved? If so when and how?
Not particularly. They Aerospace phentoype is more resistant to the debilitating effects of the Enhanced Imagining implant than any of the other phenotypes, but they still eventually take damage over time.
• Protos were designed to fight against IS forces correct? ( Not sure) besides the Fall of Huntress is there another cannon example of Protos fighting against IS forces?
o If so how did they do?
I'm sure are examples, I just can't think of any off hand. WE know the Horses uses protoMechs, so its possible that some fought against the WoB during the end of the Jihad, but I'm not sure there's anything that says "Here's an example of them fighting, and here are how they did." The Raven Alliance uses ProtoMechs, so you're likely to see fighting against bandits and maybe the Great Houses there, but again, detailed examples of them in combat are few and far between.\
• With the god complex/bonding to their machines do protos tend to stick to only one type of proto in their careers?
Probably depends on how bad off they are. There are probably pilots that are fine with changing, others that probably want to stick with what they know (similar to MWs sticking with certain Mechs over the years)
• I know protos esp the 1st gen ones were too small to make effective physical attacks against mechs but what about against infantry, battle armor or vehicles?
ProtoMechs have always (I'm pretty sure, but don't feel like dragging out the original TRO3060 to check, but I'm pretty sure) had a frenzy attack that allows them to make the equivalent of a physical attack against enemy units.
o Could a proto point ( at least in the fiction) attack a supply vehicle convey and start smashing and flipping vehicles?
Wouldn't see why not. I mean, it might have to be a lightweight vehicle, but sure, why not?
o Could protos be used as effective bandits? For example rushing a base and scooping up armful of crates?
Sure, they've all pretty much got hands, right? Some might have weapons in those hands, but for the most part, I think pretty much every ProtoMech has working hand actuators.
• Could protos be turned into terror weapons for attacks against cities and populations?
o Such as fast moving protos like the Satyr but armed with flamers
o Are protos sturdy enough to smash through buildings and generally just run amok in cities?
Any unit could be turned to terror tactics. If you want them to target civilians, have them target civilians. They might be especially good at it since they can move inside buildings without damaging them too much, and because they're immune to themselves skidding, so feel free to run around alot on pavement. It costs a ProtoMech 2MP for each hex of building movement, and you only cause 1 point of damage per hex moved, so you can move around alot in buildings without causing too much damage.