Sorry for all the questions, but...

I've found that there is a test for inventory_item_limit(), but how do I set the limit in the first place? I want to screw down the limit to a more realistic maximum, maybe 5 items. I'm sure I saw this somewhere in the user interface, but my Ctrl+Space hinting and code completion doesn't seem to work properly.

Brilliant. Thanks for that.

I couldn't get that to work. I had to use:

integers {
   max_carried : integer_const "5";
}

settings {
   inventory_items_limit_var = max_carried
}