D?j? vu I think I've seen this before...
Ah here it is:
http://www.scirra.com/forum/viewtopic.php?f=3&t=5999&hilit=rts+path
And I still like the solution I presented there.
Can you repost the link to the topic because this link is broken <img src="smileys/smiley19.gif" border="0" align="middle" />