was wondering how to move the cones placed at wingtips to avoid vehicles running over them.
The vehicles don't normally run over them. It might happen at some parking spots, and/or with some airplanes, but it shouldn't very common.
Have you seen this happening with a specific airplane or parking ? If yes, please indicate a precise case of a parking+airplane when you always see this.
I tried moving the de-icing points but no luck...Is it based on the wingtip positions in the a/c config file?
They ARE based on the de-icing points so, moving the de-icing points WILL fix this. However, they are placed on the de-icing point + 3 meters so, you might simply have to move the de-icing point more towards the inside.
However, since the problem is more usually related to the parking spot, sometimes might be more effective to move the starting position of the vehicles instead, so they take a different path to approach the doors.