Originally I thought that the ability to restore half your melee energy using the charged with light mod "Heavy Handed" would work with No Backup Plans' shotgun melee ability activation, but after testing that isn't the case. The mod is quoted as to proc when ever you use a charged melee ability and Shotgun kills with No Backup plans is stated to activate your defensive strike melee ability.
I'm sure this happens because the game is coded to just reset your melee ability's cooldown and activate the defensive strike effect, but as a suggestion I would like to see Heavy Handed work with No Backup Plans'.
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Probably won’t since the shotgun triggers the effect rather than a melee