Paladins, prone opponents and unchivalrous actions

[RMTEW FULL NAME]

From Felius@Bay12:

And since I seem to be rather talkative today, on a quick suggestion mostly related to mounted combat focused paladins: Prone enemies: Mounted charges tend to knock down your opponents, and paladins are pretty much blocked from attacking such save against rather rare exception of enemies. As such, it'd be interested to allow at least some leeway on such instead, even if just relaxing the chivalry issue exclusively on the matter of prone opponents, but maybe even keeping trip attacks as not allowed.