[Fate]

"repeat build" is handled -to a degree- by shift-clicking (it queues five soldiers instead of one).

The maximum unit limit per province per turn was 50 in Dominions 1 and 2, and was changed to 100 in Dominions 3 to encourage larger non-summoned armies (along with the 50% gold increase). It is not an arbitrary bug, and is there for strategic reasons (albeit slight and mostly limited to the realm of annoyance).

Instead of viewing this as putting a limit on your globals, try castling farmlands (which must have at least half those resources), and recruiting there. If you build a castle in every province, you could end up with many 100's of units per turn (though good luck finding that kind of leadership).