Theres lots of ways to farm rep with
The Tillers, most of them is through dailies, one though, that I wasn't aware of is the one OP is trying to explain he wants a bot for.
Normally, you plant a crop, tend to it, and then harvest it after 1-2 days. Harvesting crops give +55 rep (I believe).
On rare occations, some of the freshly plantet seeds gets the buff Bursting Crops - Instantly makes it harvestable the moment it's planted.
You can use a shovel just nearby to remove crops you don't want.
Adding the two together, you could plant seeds, remove the ones that's not instaltly harvestable, and plant new seeds, rince and repeat for farming rep.
I'd believe this'd cost a bunch of gold though, but it should offer a viable way to farm rep if you're botting.