I think I finally see the part you're not understanding: A flag will not be added when a callback already exists to perform the same task.SirkoZ wrote:To summarise all points - to be a simple one-liner property that just works - with smooth_economy. There is absolutely nothing of the kind in the newGRF specs.
CB 28/35 can:
a) work with all industry types,
b) work with all industry sets (indeed, most industry sets use at least one, if not both.), and
c) simulate smooth_economy.
That covers all your behaviour requests, leaving only the language format request. And see above for the response on that one.