Everybody and their goat had silkworm 3.5. The aimbot wasn't improved in later versions afaik...
Yes they did, but only after WA was patched. The one everyone and their mothers had whilst it was still working on wormnet was the roping/auto chute/girder kill one, which didn't have the aimbot.
I had version 4.13f 'ultra' with the mousewheel flying and stuff. Not sure if there were newer ones after that. But to be clear, I was talking about the TAS hack like ropa said, not silkworm.
That's the one Deathcharge and Deadcode used to host T17 games, again, only really made available massively when you needed to emulate older WA in order to make it work. (not saying you didn't have it early, mind (i actually recall you and lex where toying with this stuff early))
I don't remember much about it, but I recall DC chuting the whole map, or having his worm as his mouse cursor and moving him freely using him as a map erasing tool.