First of all,
Thanks for your error report. I will look into the crash and an update should be up tomorrow.
Now I'll try answering your questions:
1) On allowing claims later on:
Suppose we're halfway into a citybuilder game. There's 5 companies present, with 5 sprawling railway networks. If the 6th company claims a town that's literally on another person's railroads, this would be very bad for the game. (the person would not be able to expand/modify his infrastructure).
You did make me think though, perhaps an even better solution would be to check for any company owned tiles within a town to be claimed's local authority. If all of these tiles belong to either invalid or the claiming company's property, then the claim is valid. (otherwise, it isn't).
This way, you can't claim towns when:
- someone else has claimed
- someone else has built infrastructure there.
What's your opinion on this?
2) On cargo req variation
The point of cargo requirement variation is mostly for co-op games. If the different towns have different tastes in how much stuff they want, it may be strategic growing towns to different extent(s) for maximum population.
3) MTR is metro requirement. Basically with this option on, cities only need their cargo taken away to grow, instead of you delivering anything to them. It's ideal for a multiplayer server, where there might be a problem where there just aren't enough cities on the map. The cities tend to grow rather rapidly as long as you take away enough passengers from them with this on. (Luukland solved this problem by making towns require less than they produce but that isn't really a solution).
Edit: Uploaded v10, which should fix the specific crash. If you still get a crash this time due to the script taking too long to save, try disabling autosave.
In metropolis mode you may get town larger than 200 what makes impossible to build HQ there without demolishing houses.
This is working as intended. Default setting for max claim is 200. If you change it to 0 (infinite), you can claim any town. Note: The claim in metropolis mode is meant to claim a town other than the metropolis
to get benefits there to grow it better. (I'm still testing what works best here so this isn't implemented yet, you're welcome to supply ideas).