Its a cool class idea. Definitely a contender to eventually be made into the game, in my opinion. If I may give some ideas, here they are. The Musketeer always seems to have an emphasis on buffing partywide ranged attacks in a sort of “Volley Fire” tactic, as opposed to the Arbalest’s focus on marking and healing in a “Sniper/Support” role.
New combat skills:
Extra Powder: Self Buff that increases Ranged attack Dmg for two turns. Animation will show her pouring powder from a pouch or horn into the barrel of her musket. Or can be an attack with knockback.
Fire At Will!!: Partywide buff that adds Spd bonus to all party members for next round.
Camping Skills:
Firing Line: Party wide buff where all party members get an Acc bonus to their ranged attacks.
“Remember, pick your targets and make your shots count.”
War Stories: Similar in effect to Gallows Humor from the Highwayman and Graverobber, with possibly some different modifiers.
Clean Guns: Obviously.
Nervous Sentry: +10 Stress to self. Chance to prevent nighttime ambush and surprise.
“They won’t get close… not with me and my trusty shooting iron.”