I think what he's saying is that he autoruns while scavenging, hitting a bound key to scavenge every so often. When he runs out of energy his guy bends over and starts wheezing. At that point he wants to be able to go AFK (or maybe browse the web, whatever) while his guy recovers his energy. But because he is still stuck in autorun mode (you can't turn it off once you start wheezing) his guy will immediately start running again once he recovers enough energy. So when he comes back from being AFK or browsing or whatever his guy will not have recovered. If autorun disabled as soon as you started wheezing then he could count on his guy being fully recovered when he toggles back to Xsyon.