It will create a huge disbalance in the game, remember not all players have a brown bear. If we enabled this "back door", a host of complaints would arise, and with a reason. Many players don't have, a brown bear and some players have more than one. However, with the possibility to queue all three training queues you will get a lot more out of your brown bear. This one I don't think it will happen.
We prefer to not get very technical, but there are quite a few more factors that happen when you start to scout a province. So, besides the mana, there are a few more aspects that are interconnected with the activation of a scout.
Also, negative pop/culture does not touch as many mechanics as scouting does. Furthermore, if you have negative mana, decay needs to be rethought for example.
But as @herodite said above, it is something that the developers took note of. Right now they are working other aspects of the game as you all know. I'd say it's a "no" for now, but a "maybe" for the future...
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