I'm actually thinking about the hilts, not the crystals.
How would you, if you would, limit hilt attachments? I'm thinking combos.
I assume superior hilt personalisation can go with any other hilt, but would you allow a superior curved extended hilt? Or would I have to choose between curved and extended?
What about an extended and/or curved hilt on a double-bladed lightsaber? or a lightsaber pike? what about the shoto?
I mean, it seems obvious if these are allowed to be combined that every player is going to end up with a superior curved extended hilt for his light-weapon, unless he goes dual-phase mod and settles for one of the hilt mods... unless they make some more for the CRB or change the HP cost on some of these hilts.
On the other hand, I can imagine a curved extended hilt on a lightsaber, perhaps even a double lightsaber, it's harder for the pike and the shoto perhaps, but I'm sure it could be visualised and imagined to work perfectly well...
So, what is your opinion many faced interwebz?!