Good idea! I agree, it would be nice to make bets on more blocks (maybe on all) instead of waiting a relative long time for one specific block.
For more action, check out
http://bettingblocks.com/.
Right now, you can bet on every block # that ends in 7, so, about every hour and a half.
This is good and perfect option to have possibility to bet on any block. I am bit new to this but will give it a try to see how the system works.