Question about movement speed bind

It only affects you. What the command does is tell your game to interpret normal movement at 5x the regular speed. This interprets everybody;s movement like this for your client. Since the only person connected to your client while in town is you, you are the only one affected.

This same reasoning is applied while in dungeons. If you are the host, then when you press the command, all people connected to you (everyone in the party) will start moving faster. However, if you are just a member of the party, since nobody is connected to your client, it doesn't affect anyone else.

Basically, you have nothing to worry about by having the command activated while in town, as long as you are standing still. If you start moving, then everyone will see you jump around at warp speed.

As far as that link to the Nexon forums goes.
What happened to them is they joined a party, where the party leader was a hacker and had the speed command activated. Since the party leader had it activated, everyone in the party got it on their clients too. Since a normal user can't turn it off like we can, they are stuck with it. Then if they host a party, everyone in their party gets it too.

Thank you Zaia, that was very informative.

You're very welcome!