Thoraxas

Use an axis from your joystick and assign it to the x- and y-axis from the MMS. If you want to slow it down further, you can select a curvature for the x- and y-axis.

I just tested your mission (daytime, multiplayer server, open beta). Changing seats in the Hind works without crash. Afterwards I just created an ultra simple mission (Syria, 4 client Hinds, nothing else) -> instant crash when changing to another Hind after first respawn. Did you create your mission in the open beta or in the regular version of DCS?

To you, sorry. Thought it might be helpful to have some missions where this problem doesnt occur. Might be a clue to whats wrong here.

Could you give us your working mission files, so we and ED can test the issue at hand there?