I would love to see helos can taxi in Arma 3 and they really do taxi before taxioff even in warzones. This is mainly because of the matter of airspace clearance. In most situation, they may taxi to a runway or a specified point before taking off. However, some cases like medevac will allow choppers to land directly on a helipad and unload the patient, then they have to take-off again and land on a runway and taxi back to their pad. Some of you have mention about the heavy weight requires a chopper to do so. Some pilots will did do that when their choppers are overweighted but in most circumstances they are not allowed to do so because it certainly damage the engine.

If you dont believe chopper will taxi, go to youtube and type in "inside combat resuce", its about the Medevac crews and PJs in Afghan, a great series and a lot of scenes on Pavehawks taxing