farming like that strikes me as hugely uncommon i mean it isn't exactly hard to get damage in when your playing the game
i think the easiest way to deal with farming is too just have all the data regarding whose ship was damaged by who recorded soo if a player has down lets say 2,000 and the other player hasn't done 300 damage or a high enough number of combined damage stat then he should be looked into as being farmed upon
but too be honest this is just friends helping friends and aslong as it doesn't happen in pvp or pvp light i dont even see a problem with them doing it if they want to ruin the fun of playing with the ships and learning them as they go then it is there choice to do so