Increase taxi time from the current 3 sec to about 10 - 15 sec.
It would require a fix for the bug where increasing the taxi time causes the aircraft to appear away from the runway.
originally by @jakcharvat in openscope/openscope#1227
Honestly, the real answer here is to remove the taxiing and clearing. They should depart on their own and then contact us. We could extend the taxi time, but if we're going to touch it, we might as well do what we need to do anyway and just turn it all off.
How about making taxiing optional? (switchable in settings)
another possibility: