Paralyzer is a weapon , right ?
So why you can’t use it as a weapon, from action middle menu, or as a med-kit, for matter of sake ?
Damn it, I spent hours bashing the pandorans with paralyzer 
without being able to capture one 
until I discovered you need to click on them and select this action with mouse.
The matter getting even worse if you wish paralyze the Mindfragger attached to one of your solders - you need to click not on the solder, but “near him”.
Btw: I find it rather strange that if you paralyze such Mindfragger, the solder under it min control still acts against you - is it intentional (body paralyzed, but mind still works kind of thing) or just another semi-bug ?