I've made the default droideka be able to shoot from his 4 hands by adding 2 more hardpoints like in this picture:
and by modifying the odf like this:
cis_inf_droideka.odf
However when I try to do the same with Jango's mesh (add 1 hardpoint and modify it's odf similar to the droideka one above) it only shoots through one of his pistols, not both. The animation works perfectly! I've used the dual weapon animation and attached his 2nd westar to the model like this:
The only thing is that I can't shoot from the 2nd pistol barrel.