sigh, best Alex...
please listen carefully and promise me you will never call us clowns again, please...
here is the solution:
If you place an exploration site on your map, he defaults to average defenders, which means he will pick one race of the races available on the map and randomly select average strenght units.
Now, if you want to put your own defenders on this site, set it to 'none' (no (random)defenders)and place the units you want on top of the site, these will then automatically become the defenders of the site and will be invisible on the map, just like normal defenders. !
about items: if you place an item on a site, it will replace the random item in the site with the item you picked.
also, in this way: you can also add units to the random defenders, ie: if you place a kharagh on an average defended site, you will find there the random units PLUS the khargh.
now please calm down everybody and get your spirits up!
the editor is great, there is absolutely NOTHING wrong with it, but, as with all editors, first you'll have to know the tricks.
glad to be of help, Wazzz