Keep "Game" as only game for fun. some have lot of free time , but not all have too much free time only for game. they have their real life that need some responsibility. i cannot enjoy alone ( without helper) game's all features. will stuck only in harvest and seeding again and again.
I suggest we wait to set any "rules" until we see if the contractor-issue is solved in next upcoming patch (188.8.131.52). With contracting working, it will be much easier to pay other players for helping out as well.
Also, if someone is alone on a team non-use of helpers is totally meaningless since "noone" likes to sit and stare at the screen steering the vehicles manually through a large field "for hours"...
Anyhow, the "use of helpers" feature on server will not be turned off at all So in the end, it's up to the farm-manager how to organize their farm