I can remember back in the 70's if you applied for Bighorn Sheep, you could not apply for a other tag. It was later changed to include Moose and Goats. I also remember when only residents could apply for Moose. That rule was changed later also. Why doesn't the Fish and Game start with a point system for Sheep and see how it goes. You could add Moose and Goats later if all went well. Deer, Elk and Antelope could follow.
In 2010, the Idaho Fish and Game Commission considered adopting a Bonus Points system, but ultimately decided against the proposal. The Commission cited several reasons, including a lack of consensus among sportsmen. Here's a link to more information about the history of Bonus Points proposals considered by the Commission:
As the makeup of the Commission changes, it is possible aBonus Points system could be considered again sometime in the future.