When flying the R22 with keyboard or without a physical slider control on normal 2D monitor, it is very difficult to determine the current position of the collective.
Control is especially difficult due to the latent visual effect of any changes to the collective.
The (2D + button bound ) user is effectively flying blind until they either pan the camera down or wait several seconds to observe the movement effect.
Please consider adding a visual collective indicator, next to the current throttle, on screen in the Flight Information panel.