It's not really possible to include different yakis clans that can fight each others without massive amount of scripting. Moreover when the "Race Response Fleet" is installed, Yakis already have enough enemies without having to deal with internal politics.
Anyway, here's how relationship will work once both plugins will reach 1.0 stage : Relations between the Yakis and the Pirates will evolve. Sometimes Yakis will protect pirates assets, and sometimes they will raid them like other races. BBS News will be displayed accordingly (i hope).
Same thing about the player, entering in each guild and helping pirates or yakis will increase your relation with those races. Attacking their assets and ships will give you money, but it'll reduce your relationship and will probably lead to retaliations from them.
I'm open to suggestions, but i've still a lot to work to do before making a first release of Pirate Guild for X3 available. And it may take a long time to include all the features I already want
@liquidthunder: It may be a good idea for a guild mission. Supplying a given amount of shields, missiles and/or weapons to the Yakis for money and better relations.