First off, I apologize if this is already posted in elite. I don't currently have access to it to check.
Gadgets and medishots can be used multiple times at once. This works great with the PvP healing gadgets.
In order to reproduce this: put the gadget/medishot on multiple action bar slots.
Use a keyboard macro or an equivalent program to hit each of the keybindings simultaneously.
This will result in being healed multiple times. You can heal yourself and party members from 1% to 100% instantly.
Side note: Only one medishot will be used up, but you'll get the benefit of many of them at once.
Enjoy while it lasts.