Monsters can be done by hand without using the bestiary, however expect to do everything manually. As for the the race part, you need to either have the advanced race guide to go further with the custom monster via that method. If you do have it, but are not satisfied, then you must create the race under the race tab in the editor.
Quote:
With a timing of First 5000:
~we don't have a CON score
perform hero.child[aCON].assign[Helper.NoScore]
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This kind of script adds the - to the ability score you specify, the above does CON obviously. So where aCON is change that to aWIS or whatever you are going for.