Oh sweet! WoL actually doesn't have much people who make scenarios with, so it's always great to see posts like yours.
1. Try to find the word in stringtabley.xml, and find its ID in techtreey.xml
2. That depends. You can change the PopCapAddition of houses.
3. Not really, no. Unless you want a fixed pattern, which is not visually enjoyable
. Didn't try it yet, but: you could create custom "forest" in bin\Data (find any forest xml file), draw ingame and then delete the file.
4. Yeah, WoL has the most advanced editor by Reyk, and it's already good enough in my opinion. Unfortunately it'd be complicated to replace it with other editors since there would be UI conflicts.
If you have Discord, you could join us: https://discord.gg/DQjkRVr