So one of my players is focusing on using the force rather than weapons to attack and even then he's always trying to talk his way out of combat which I really like.

He wants a lighsabre pike so can defend himself should he get targeted by a dark sider and I'm trying to come up with a crystal that better suits his character.

I was thinking a crystal with:

Damage: 5

Crit: 2

Breach and sunder

As long as the crystal is on his person he can add force dice up to rating to charm and coercion checks (as with enhance for the skills listed in that power).

Lights pips can be used to add success or advantage to charm and dark pips to add success and advantage to coercion.

Mods 2 +1dmg; 1 ability can also be used on Leadership tests.

What do people think?

Do you have any other ideas?

Way too good.

The Charm/Coercion part largely mimics the Control Upgrade for Influence, and gets worse when modified.

I'd suggest revising that it instead grants a single boost die to those checks. Otherwise, you're pretty much handing the PC a very powerful upgrade to their Charm, Coercion, and eventually Leadership checks, especially as they add additional Force dice.

You could also just reward your player with a Dantari crystal. If you want them to have the ability to add force dice to social checks, 30 XP invested into the Influence power tree can do that.