In my game, I have decided that:
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Yes, Mr. Handy’s can attach new weapons and tools to their arms. But, because General Atomics built them out of very specific modular parts, this is quite difficult. It is not as easy as detaching a pistol and adding a shotgun. It takes some serious Repair skill, Rare Materials and Robotics Expert. But I recently let a Mr. Handy player replace his buzzsaw arm with a pneumatic launcher that throws stuff at long range and its awesome.
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Nope. Again, General Atomics not only wanted to protect their patents, they also cut every corner. Trigger and targeting mechanisms were tricky and hard to access. The Rust Devils in Boston needed a lot of expertise just to make Mr. Handy Buzz Blades.
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Yes. Things are made of parts, and if you know how to Repair things, you can change out those parts.
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I say no. As written, it totally should. A min-maxed Mr. Handy could be an Energy Weapons sniper monster. But I don’t like that. I want low-level characters to be weak and, like, earn stuff.