There's one thing that I often want, though in a way it's not the kind of thing the mod usually provides. Specifically, I want to know how many turns it will be until I can whip something. However, to get a real number is a huge task- pop might grow, that might include additional tiles' of production, etc. However, I would love even a simple "at your current population and

/turn, you will be able to whip this building in N turns."
I guess the formula would be something like this:
ceil( (

hammers: required to finish) - (floor(Pop/2))*

hammers: value of 1 pop (varies by game speed))*

hammers: multipliers)) /

hammers:/turn) )
Which when you don't have any forges or anything tends to be simple enough, but vary your game speed occassionally and build a few production multiplier buildings and it takes just long enough to recalculate each time you want to know that it occurred to me to post it here.
Personally I would just have the numbers jump as appropriate if pop grows or whatever- while mostly BUG doesn't give "rough" numbers (though one example thereof might be the projected voting totals), this would make it basically parallel the actual "turns to completion" number that the game gives you, which jumps when you grow one pop and bring another mine online.