[Paddlewise] Drogues and Separation from Kayak

Regarding methods for preventing separation from your boat during a capsize
in heavy seas/wind - 
Is it principally wind that causes such separation or can wave action and
currents do this also?
A paddling mate has suggested tethering a drogue to the kayak and then
attaching the drogue to your PFD using velcro. The idea is that if you fall
out of the kayak the drogue automatically deploys and stops the kayak
drifting away. Has anyone tried a system like this or know of other methods
for preventing separation from a kayak? Or know of a suitable drogue? 

All the best, PeterO
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