With sleep songs? Sleep arrows? AoE Sleep songs? AoE Sleep arrows? Your third question has already been answered, but I'll say it again: Too many times I've seen some random single party member jump on a Choco, ride headlong to a distant group of mobs and only bring back 1-3. This after some time had passed as they tried in vain to trigger sight aggro, only to get their Choco maimed and make it back far too slowly. This given that you're fighting mobs that do aggro.