One of the suggestions to resolve the Pioneer Bank issue, which would also resolve one of the problems the AI has with a population cost on Pioneers, is to bind the population cost to the Settle action.  While it doesn't make too much sense from a realism perspective (you could say that people didn't move out to the city unitl the pioneers built it, I guess), it makes perfect sense from a game perspective.  It would also allow for an alternative cost to constructing Outposts, as people generally don't want to spend 30 population just to build an Outpost.  The trade-off would be that losing a Pioneer in transit (to monsters and such) would no longer cost you the 30 population, but I don't really see that as a problem.

Scouts just look at things.  They don't build things.  Having them make outposts would be weird.

why pioners can't drain resources on completion and if there is no resources at time of complition it just set on hold or canceled???

best way to reset timer each turn as long as there is no resource. 

Another way to solve pioneer bank issue: During Pioneer construction reduce food by 30. Those 30 food will be returned once the Pioneer is built or cancelled.

That way constructing Pioneers don't result in additional growth during construction. Additional growth will only come after construction.

The pioneer bank is still alive and well on release.  I hadn't even heard of it before trying the game, but it's a pretty easy bug to stumble upon.

Say the current city levels are (they've been changed but I'm too lazy to find what they are now):

Lv 2: 50 population
Lv 3: 200 population
Lv 4: 400 population
Lv 5: 800 population

Then instead have

Lv 2: 30, Lv 3: 60, Lv 4: 100, Lv 5: 150, Lv 6: 250, Lv 7: 400, Lv 8: 600, Lv 9: 900, Lv 10: 1200

(this is a quick example not a thought out level proposal),

then you are going to get lots of cities with high levels. With lots of levels, each city can specialize in a very specific thing, much like you do for a hero.

it's  just an exploit when you queue several pioneers to artificially boost growth. a single pioneer in the queue hardly matters.

it's not an urgent problem since it's easy to avoid the exploit. if you want to cheat, there are easier ways to do it, if you want to play fair, just don't do it. sure they should (and probably will) fix it eventually, but it's hardly a game breaking issue.

ok that's a fair point. it's not directly related to the "queue 10 pioneers to keep the level 4 city at maximum growth" problem, but could probably be changed/fixed with the same solution. don't know if it's really a problem, though. i mean, adding 10 pioneers to the queue is obviously a chesy tactic to exploit the mechanics, since you don't actually want to build those pioneers but only want to reap the benefit of the side effect of adding them to the queue. using a weak food location for a dedicated "pioneer pump" isn't on the same level of "cheese". it's more a case of "clever use of game mechanics". but that's just my opinion.

I really think scouts should be consumed upon building outposts for free.