For me this sounds like exploit.
That possibility should be removed IMO
it is not an exploit, it has been on Vanilla since it was released, the difference is, that in vanilla Civ 4 you can only produce/research one thing at a time, even if you have enough tech/hammers for multiple ones, so this is basically a product of the multiple production/research option this mod has
basically when you hurry production one building/unit it acts as if you already completed it,for example, if you didn't hurry production the unit/building at the top of it, if there's an overflow of productions it will go towards the unit/building bellow the one you hurry production of, so long as there's a queue of things in your build list
what this means is that you can technically hurry production all the buildings/units you want in a single turn and have them be ready/created at the start of your next turn, note that this is ridiculous expensive so you really can't relly on this,hurrying production with gold also generates a ton of inflation, if you are not carefull your theasury will suffer a big hit because of it
i mostly use it for newly capture cities, in conjuntion with an unit that can give free culture to it ( storyteller, celebrity, etc) to take the revolt turns away so the city is ready to build right away, you can create walls/defensive structure/units in a single turn and have them be ready for the next, it is really strong but expensive as i sad before, the thing is that most of the time there is a ridiculous amount of buildings to queue up and hurry production off (specially when you are really ahead in tech) so it gets really really tedious to have to hurry production each one of them separately, if there was a way to do it all at once it would be a lot better