Hi - I’m quite in programming so I’m asking here. Does anyone here could write a script that would change names of every bone thats name ends with R into L. And the same with vertex groups names. 
I would be soooooooooooooooo greatful
Look at my Mirror Tool, it does vertex groups mirroring and also changes vertex group names. Unfortunately, it hasn’t bone renaming.
It would be a simple thing to get the bone renaming, the process would be.
armature = Blender.Armature.Get('mirror')
for i in range(0,len(armature.getbones())):
str = armature.bones[i].getname()
str = str.remove("R")
str = str + "L"
armature.bones[i].setname(str)
don’t quote me on that code i doubt it works but it would be the process simplified a bit and the syntax is probably messed.
MacBlender