It should be useful for melee characters that are tired of clearing rooms filled with low-level enemies like rats, since with this addon you can just mash X to clear the room.
You can change the shortcut in Key Configuration menu under Actions group.
I don't take any responsibility for any accidental deaths caused by recklessly using my addon.

Download it here: http://te4.org/games/addons/tome/auto-advance-action
Known Issues:
* PC doesn't approach enemies properly if there are obstacles in the way.
To other addon makers:
I'm still not familiar with ToME scripting very well. Right now I calculate the direction to move towards the enemies using "util.getDir" but that doesn't work when enemy stands around the corner.
Is there a better function to calculate direction of the next step to take when moving from A to B?