How are you activating your Agility Boosts as a Free Action?
Body Boost will get you extra dice on your Adrenaline Boost drain resistance test, as well as other damage resistance tests. Just a thought,
derp. Adrenaline boosts are the Free action, Attribute Boosts are the Simple. So for a Pistol Adept you can still Free Action Adrenaline Boost, Free Action draw pistol (with Gear Access), Simple Action Agility Boost, Simple Action bang-bang. Melee builds are going to lose an attack if they can't pre-boost out of combat. Same issue that the Elemental damage powers have. So probably not optimal for melee, just like the Elemental Melee damage powers : ) I'll update the OP.
You can do it, it just takes a little more investment. If you get the Rapid Draw adept power, you can do this:
Free Action Adrenaline Boost, Simple Action Agility Boost, Free (Simple) Action to Quick Draw melee weapon (Quick Draw -> Attack!)
With Perfect Time, you could even do:
Free Action Adrenaline Boost, Simple Action Agility Boost, Free Action to Quick Draw melee Weapon, Simple Action Reaction Boost.