-Make them wieldable in 1h but no sting (or spear moves, see below) when used that way (i.e. throwing only)
-Increase size to 3x2
-Increase damage to be comparable to bows, possibly reduce accuracy slightly (but not aim speed)
-Add a spear only block, Fend, that causes enemy attacks to cost 1 more IP and give you 1IP when they attack. Probably blocks 3 things similar to shield, but no multiplier.
-Allow spears, shields, swords equippable in the backpack slot
-Implement hotkeys in Adventure menus to switch left and right hand slots with backpack slot (needs to be two hotkeys, otherwise my leftie characters will be sad!)
For custom clients (probably): add Spear on minimap :p
I was having a lot of fun throwing spears back and forth in spars, sadly atm the interface and the low damage makes it hard to use effectively.