@ (TLL)CapperDeluxe: Thanks for answering me. I do hope nothing will be forgotten/lost in here.
So the "Throttle"-setting for VTOL and ASF is different from the one in the vehicle-tab. This should be made more obvious.
PS: Maybe the conflict-check should also check for different functionalities? If there actually are two places to set my cbill-controls, it should not tell me that i caused a conflict by using the same buttons. It does not have to be removed, maybe it is useful to some people. But if a button is used twice, there could be an additional check whether it is bound to the same function twice. If that's the case, the warning is unnecessary.
PPS: I just noticed that there is an explanation for the different throttle-things inside the Actionmapper itself. To me it is not as understandable as the answer CapperDeluxe gave me, but it is there. And the throttle from the vehicle-tab actually works even if the ones for VTOL and ASF aren't set.
PPPS: Maybe the throttle-setting in VTOL- and ASF-tabs should get the same name?