first of all i have been thinking for a while what this game need. so im gonna post some ideas.

SOUNDTRACKS: soundtracks while playing would be awesome. (my opinion) you can use the arrow keys to change shuffle turn/off on songs.
left and right are to change songs. and up and down are to toggle. (on and off)

now im no COD fag but listen to the music? good?
http://www.youtube.com/watch?v=Djul03GcHjY
this would be 1 song for general game play. it would suit it good?

now if we had a zombie mode (survive AI bots then get to the choppa!) maybe this song wold help for last few minutes of survival
http://www.youtube.com/watch?v=oRDqYXe0Sr0

WEAPONS:
a Molotov cocktail has 4x4 radius breaks and does. not bounce in contact with blocks. splash damage. depend what part of the fire you are in. continuous burn depending where you are. does not work in water and if on fire water puts you out.

sawed-off shotgun hold 2 bullets (as its double barreled.) 16 reserve rounds. very effective to head & chest at close range. not good at mid-far far distance range.

mounted light MG (browning automatic rifle a WW1/WW2 weapon so none of you bastards complain what type of game it is).
holds 75 rounds. and can be deployed. slow rate of fire and walk speed is reduced. vulnerable but very good support weapon for when times get though.

there will be more later in the post. comment with constructive criticism.