It will help and make event bosses way faster and player will stop afk after getting the minimums hits. Maybe if someone stop moving or pressing any key for atleast 5 minutes he will be kicked from the map
Think a better solution is to just lower the hp. Look at cake boss, if you afk or miss hits, you end up not getting a reward because that boss gets killed so fast. This boss is just soooo much damn hp, it feels like 10 minutes a kill. Yeah it drops a really nice helmet, but cake boss dropped 200m scrolls and sometimes chance for ws cs through pirate map. Also cake boss being killed so fast made that event so much damn fun. Felt like a race.