If the glaive melee is not going to get any benefits from melee-buffing perks, it should AT LEAST be considered an elemental attack when it comes to breaking shields or triggering elemental related effects like elemental armaments or path of burning steps, even if the damage buffs only apply to the ranged attack.
As it stands, performing a glaive melee is worse than a regular uncharged melee, which is really kinda silly.
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Elemental melee and for some of the damage perks to be adjusted to affect melee and not be op. Swashbuckler should affect melee for sure. Adjust rampage/frenzy damage on a per weapon type basis similar to Vorpal. That or adjusted based on which method of glaive attacking you're using (full damage with shots, reduced damage with melee).