It would be cool. Big work for Doog however.
Only way for the house to limit min/max spreads is to put each user in a "time out" in whatever min/max bracket they're in. But then they'd just open a 2nd account and both each bracket with a different bot.
I think this can be done on the investor side, with each investor specifying a max bet percentage between 0% to 1%. That's not really so different from what we have now... investors are either at 0% (divested) or .25%.
From the gambler's point of view, nothing has changed. He sees a max bet (max profit) and bets accordingly. The profit or loss is distributed over those investors who were willing to cover the bet. For small bets, it's distributed over all the investors (non-0%), since they were all willing to cover small bets. For a large bet, the profit or loss is distributed over those investors willing to cover large bets.
The details need to be worked out for a couple of things. One is the calculation of the max bet, the other is exactly how the profit or loss is distributed. For example, if someone bets 100 BTC, maybe 10 BTC of the profit or loss goes to all investors willing to cover 10 BTC bets, the next 10 BTC goes to those investors willing to cover 10 BTC but not 20 BTC, and so forth. But I think if the distribution algorithm is set, the max bet follows.