[agracier]

You could extract the actors file of the map your working on with the Actors tool,then take the .mis file and copy the text from [Buildings] over to the outBuildings.txt that is produced when extracting the actors.
rename .txt files back to inBuildings along with other needed files, and re-compile the actors up with your new .mis file Buildings added to it.

When you say the actor's tool, I take it you mean Zuti's Actor Management Tool? I hope so at any rate ... this is a tool that I have an inkling (nothing more than an inkling mind you) of how to use.

I do however understand the principle of your explanation for which thanks.