Active movement in Diablo games are determined by input (like any other game), the difference is that with Diablo type games, movement is determined by active clicking. There is no "autorun" so-to-speak. It just runs to short distanced point that you actively clicked. It's a slightly different system with movement in a game that is only determined by point clicking.

For the most part, MMORPGs register active input, so simply auto-running will not register.