DiscoLizard

KMP already accomplished the time warp problem. When a player warps they go into a different phase from the other players. Then when they leave the ship other players can sync to that position, and because there are no multi-gravitational objects in KSP it is all very accurate and easy.

Absolutely! I have accidentally hit debris while en route to a solid orbit. I typically launch into the same 0 degree plane every time, so most of my debris is centralized along that plane. While launching an EVE lander the vehicle was struck by a large fuel tank, sadly it destroyed the entire launch vehicle in the blink of an eye. I had to review the crash data meticulously to figure out at the end what actually happened. This is a SUPER rare event though, so I am actually a bit happy that it happened to me.

I don't think VolitianK wants people to build to a standard, but rather for uploaded crafts to have information available so that people have a better idea of the capabilities of the spacecraft before they download it.

That's a good question. If the game constantly generates new area as you travel then it might. However if there is an actual barrier I haven't heard of anyone hitting it yet. Just Kraken stories.