OpenTTD

There are situations, where "full load" and "full load any" is not sufficient for optimal operation.

In case, where vehicle have "major cargo" (for example 400 passengers in airplane) and minor cargo (50 bags of mail in same airplane), you usually want to wait for major cargo (passengers) and perhaps some mail. "Full load" will cause to wait for mail too (which can be bad if the mail "runs out", especially if it is picked up from station by other means), "full load any" can cause the planes in other situation to load all the mail, perhaps few passengers and then leave airport mostly empty.

The worst case is if you use SH125 to transport oil. Since the engine can't be refitted to oil, you keep it as is (capacity 2x4 bags of mail), set "full load any" (we don't wait to load any mail, right?) and off you go .... but if the station from which you take oil does somehow provide mail (like if some city later grows to vicinity of your oil-loading station), "full load any" will cause the engine to load 8 bags of mail, some oil (usually much less than full capacity) and depart. Down goes the profit on that line...

Therefore I suggest adding "full load major cargo" in addition to current two types of full load, which will wait for loading the cargo that have most capacity in the vehicle.