Recently, WilderWild (MR) added a interesting wind feature that will orient both wind particles and tumbleweeds direction, and since FallingLeaves also have an wind option i thought if would be possible to FL to orientate its leaves particles accordingly to WW wind (if installed, of course).
According to Lunade (that implemented this feature on WW) on FrozenBlock's Discord, he added a mixin for that on WW side, so theorically would be possible to FL pull the information to use on its end.