It would be nice if the farmer supported any crop that can be right clicked to harvest. I've noticed so far it does not support:
Nether Wart
Ender Lily
Red Orchid

Also it would be nice if it would NOT auto till the dirt, so that I can have farms of custom size as long as it's within there range without having to remove any tillable land. Perhaps a configurable size would work, too,

This is all a feature in 1.11 and won't be in 1.10. Sorry.

The farmer still can't farm Ender Lilys in 1.12.1-r119 :)

Strangely enough, redstone orchids work, even though both are from the same mod (Extra Utils 2).

hrm, hold on, now it stopped working on redstone orchids as well...

something is wrong here

Oh, never mind, it only operates on stuff in front of it.