There's no rule preventing people helping with any DCC problems. The rule is not to help with issues clearly relating to illegal filesharing and to a lesser extent mass filesharing in general.
As far as war scripts goes, I don't know of any written rule, but I think it's generally accepted that it would come under common sense. War scripts and "IRC wars" in general have caused a lot of problems both on a channel level and for entire IRC servers and networks in the past. I don't think it takes a great deal of understanding to figure out why people aren't too happy with people posting scripts to that end on this forum.