Could you add something like this? (Attachement)
It has the possibility for a delay via something like ?delay=5000
I quickly coded this today for me ... because of the Capture-Card delay
(PS4 controller works still on PS4 while connected to the PC via USB)
I don't know if the code is nice enough for publishing...
Perhaps for official release there should be a switch in the code to not use the queue if delay=0...
The Queue.js is from here:
http://code.stephenmorley.org/javascript/queues/
(And I've done a Wii U Pro Skin but I don't know if its ok to post because I used an image of the gamepad from Google)