When binding throttle thumb down using Triquetra Input, throttle thumb down doesn't increase your engine tilt. Instead, if you have a sensor of interest selected, it slews the SOI down. This issue has no known workarounds.
1. Bind Triquetra Input's "throttle thumb down" to a binding of your choice (in my case, 4-way hat down on an X-56 Rhino throttle). 2. Load into a vehicle that features VTOL capability (such as the AV-42C or the F-45A). 3. Attempt to tilt the engines down for vertical takeoff using throttle thumb down.