So, option D above is already true (cost of 2 coins after 3 views).
Option 1 above is also kind of true (you get given nine coins, so there's one spill over coin for a "free" re-roll.
Option 2 is cool. Note sure about suggestion 3 - what are you hoping to gain there? Personally I like the speed of ramp.
Idea 4 listed above is already implemented (little spiral arrow, bottom right, took me ages to find as well).