For a warp to work without much annoyance, I think that atmospheric warps have to be eliminated for multiplayer games. Also, I think that the MechJeb auto-warp tool could be improved for warping until a certain position (like when you click on a certain part of an orbital line, you can click on "place warp node", which places a node where you can warp to automatically and (if the orbit isn't on a collision course or planet escape trajectory) the number of rotations until the warp ends. The system would keep track of what would be the highest warp speed. If a spacecraft is stationary, the player doesn't have an orbit, but sometimes it needs to do time related tasks (like mining in the Kethane mod), so blocking warp should always be available (also in space)