As others are saying, the one action "limitation" is not a limitation at all.
Note that aside from functions, the other thing an action sets is your event handler, my.event=...
Now, while you can explicitly change teh action at run time:
ALL THE FUNCTIONS WITHIN THE ACTION AND THE EVENT HANDLER **CAN** BE CHANGED AT RUN TIME.
So as was stated above, you can put all of you entities functionality into one action and then change teh internal functions and events to suit the situation.
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The tutorial conserning this issue are really poor. I wish I could post more usefull information about this.
That's becasue there isn't much RTS development in 3DGS. This has nothing to do with the capabilities of 3DGS; it has everything to do with it's users.