VTOL balance adjustments
I noticed a weird thing with VTOL's in vertical position, they naturally fly backwards more...Its also fiddly to place VTOL engines because of them not 'snapping' into position. I would love SOME changes to make VTOL's easier to balance. Maybe 'Ballast tanks' which can be set between manual, or automatic balancing, so you can actually make a balanced VTOL with a nice design!
Like on rotators so you can set the speed and angle of the nozzles before putting them on, so they can be slower or faster and the range of motion is variable as well.