1. If i understand your question right you want to give a unit a vibrosword for the left hand using the doubleweaponskeleton. You cant just rename the animations because they made for pistols. (i dont want to go into detail here, if you want to know more about animations etc./dont understand what im writing, read the instructions in the doubleweaponskeletonreadme)
Anyway, i dont know if this works but if it does its the most easy way to do what you want:
give the unit the animation you want (i suppose its aalya), but after the animationname write the name of one of the doublepistolanimsets like
this can be used to make the unit load anims from another animset (aalya) when it cant find them in the firt animset (jango) and since there arent any "saber" anims in the "jango"-set it should load them from the "aalay"-set. if this also applies for the basepose it will work, if it doesnt, well then it wont work
the second way (which will definitelly work) is only possible when using a unit that has the normal skeleton (no wookie, twilek, magnaguard etc.) is explained in this tutorial:
http://www.gametoast.com/viewtopic.php?f=27&t=10000
follow it except that you have to copy all animations from the "aalya"-folder (if you want to use that animset), rename the aalay in front of the anims to the name of the new animset and instead of also copying the basepose from there you take the one thats included in the doubleweaponskeletonassetspack
this may be hard to understand first but after you understood the animationsystem of battlefront it will be easy
2. you have to give the unit the left pistol as addonmesh (as written in the readme)
