I get the idea of keeping things fair and not making the non-donators left out/disadvantaged but i strongly disagree with this.
Sure fall damage can be a crucial part of combat from time to time, but nofall has been the only command that has always been allowed to be used for advantage, and its nothing compared to what some people expect to be able to do when they donate. The point is though, I'd like to think there is a balance for whether making a donation and getting access to cerrain commands makes you overpowered to the point where you're just pure annoyance or it's completely useless and is completely bound to a huge set of rules that come with it, and I personally think nofall does a great job keeping that balance.
Simple, but effective. Nothing someone will get extraordinarily mad at, nor something awfully boring and unnecessary.
I would also support the idea of adding a few more very slight combat enhances to donators (1 health regen etc.) but I can understand if people disagree with that or even want me to be burried alive just for the thought