IDEA 1: Machine Guns. You can mount them on a player placed block. You can use them un mounted.

IDEA 2: Sniper Rifle. You can mount them on any block. You can use them un mounted. You can have variable zoom. 1 hit kill.

IDEA 3: Toggle distance of viewing.

IDEA 4: Different Blocks. Sand Bags (If shot through a sand bag you loose less health then usual.

IDEA 5: Melee. Knife. Sword.

Hmh, for the ideas 1, 2, 3 and 5: Try to IMAGINE them, how would they act in game, how would they feel for you? I guess not that good. For idea four, you might want to check out this thread: http://ace-spades.com/forums/topic.php?id=295