To start off, love your game. Can not stop playing. I see a few suggestions for bots in the forums and here is my suggestion.
Each Bot has a "battery" for power. Crude had a battery power of 50, Basic 75, ect. You can spend your power on different 'skills'.
5 power carry one item, 10 power carry two items, ect.
10 power for slow walking, 20 power normal speed, 30 power fast, 40 power very fast, ect.
5 power for action (pick up, crop, cut, milk, ect) for slow, 10 power for normal, 15 for fast, ect.
Maybe one for brain, 5 power for just commands, 10 power for commands and a forever, 15 power for commands, forever and one repeat, ect.
So you can have a slow bot, but it can carry a lot. OR a fast walking bot, pick milk cows fast, but only can carry one item.