Tried to make the spas like in the single player with dragon's breath bullets.
Here is the video:
[youtube]Ja7-WnJcMcs[tube]
This mod actually gives the host (you can change in _rank.gsc) every time he spawns a spas with dragon's breath bullets.
You can change the settings of the dragons breath by going into _burnplayer.gsc and modify level.flameDragonDamage or level.flameDragonsTime.
Download is in the video description.
I think zombie mod with this weapon will be pretty awesome