AFK Heimerdingers... In Co-Op

So lately I've been noticing a lot more "Heimerdinger players" are popping up in Co-Op Summoner's Rift, but most of the time they just end up setting camp at the wall behind Gromp and using their turrets to aggro them. However Gromp never reaches them in time to attack because of the distance, so it's just an endless cycle of aggro and de-aggro when their meter runs out and somehow this counts as being an "active player" for Heimerdinger.

Pretty much a loophole in how to trick the system into believing they're playing the game when they're actually not, and it kinda bothers me. I don't like the idea of other people mooching off other's time and letting them do the work while they just afk. It probably doesn't sound like a huge issue given that it's Co-Op, but there's a lot of people who do play it often and this sort of afk behavior obviously disrupts their experience.

If there's a way to solve this issue, I'd probably increase Gromp's attack range.

but uh yeah. Afk Heimerdingers in Co-Op Summoner's Rift. A pretty annoying issue cause essentially it's free IP to them.