[Ballbarian]

Something like the mini-map battle simulator?

Yep. Something very much like that Gandalf.

Hmmm... But that means that I need to create a mini-SemiRandom that will read a gan file's contents and perform the random functions to generate the sample map code...

I will have to think on this more after this round of updates is complete.

Is there an undead tag in the unit finder? Lifeless works, but picks up elementals and such. Am I just being blind?

Look under "CType" (Creature Type).
This includes:
Normal (not one of the other 4 types)
Undead
Demon
Magic Being
Animal

Is there a way to open and edit a previous GAN file?

You can't see it, but there is a "Load" button in place, however, that feature is still several versions away from being enabled at the moment.

For now, if you have already saved and then find a minor error, or something that you would like to change, just open the GAN file in a text editor and make the corrections from there. Or, when it involves something a little more complex, just pop into the province editor and create the code that you want, select it from the preview or garrison text box, use right click + copy, or CNTRL+C to copy the code and paste it into your open GAN file where appropriate.

Sites: Killfeatures remove all previous sites, correct?

Correct.

If I do not add killfeatures, will manually added sites supersede randomly placed?

I believe that if you do not use killfeatures Dom3 gets first dibs on filling those 4 slots. That means that there is a risk of your manually placed sites not having a spot to fill and they will just be ignored.

If I manually add 2, is there still a possibility for 2 randoms to show up?

That is my understanding of how it works. Except a better way to look at it is that it is possible that 2 random sites will be placed by Dom3 and (if you are lucky) 2 slots will remain for your 2 manually added sites.

Would it be possible to add a "all" selection under Lead in the unit finder? So I can sort just by commanding ability?

As it is now, the "all" is implicit. Just uncheck the "Lead" filter, and all units will be listed. There are very few units that have 0 leadership if made into a commander. (Correct me if I am mistaken on this point!)

What does "clear garrison" do? Remove the province population starting troops? Is that something I should have been doing with my other gans?

The "Clear Garrison" button is just a quick way to clean out the Commander/Units section in Step 3, as opposed to the "Clear All" button which resets EVERYTHING. "Clear All" is essentially like closing the program and restarting it again.

Usually I will create my province, preview it in Step 4, and then hit "Save and Add" when I am happy with it, and finally hit "Clear All" to start the next province project. The exception being when I have another province in mind that is very similar to the one that I just finished, and then I might just hit "Clear Garrison" and then make changes from there.

Going back to your previous examples if I enter 10 commanders and hit submit, it then shows up as @10 commanders. Does that mean only certain ones will show up randomly or will all 10? Same with troops?

If you enter 10 commanders & hit submit, you are telling the province editor to generate code that will tell SemiRandom that you want 1 of these 10 commanders (selected at random) to appear in the province when the final map file is generated.

Same with troops.
Same with ANY list in the province editor.
The key thing to look for is the "@" symbol in the generated code, which is your signal that ONE of the things in the subsequent list will appear at that spot in the final map file.