Killing Guildmate solution?

[Cremated]

When starting the guild Guildmasters can check a box that states wether they kill guild mates or not so,

When theyre are in battle guild mates will not do damage to one another.

[Limsi]

This is very complicated to implement, not to mention this would ruin the concept of PvP.

[Daddyblu]

LOL! this is a noob way! it runes all.