I'm sure it's do-able, however the complication is that so far as the client is concerned, the crop is just an object that it's allowed to request an interaction menu from... The server then gives it a list of things it can do to interact with said crop, and then the user picks one so the client sends that to the server.
So to make right click instant harvest, the client would have to be substantially more intelligent than it is, and it might make it harder for Loftar to arbitrarily add more functionality to the crops at a later date (eg, fertilize, pollinate by hand, shake, remove aphids).
If there were some other programmer, or group of programmers who would dedicate their time to maintaining a slightly more intelligent UI (hint hint nag nag) then I'm sure harvesting would be made pretty easy
