I don't see a datasheet from an original manufacture stating it's designed to work at other then 'standard' servo update/pulse width control.
I was suprised when I started looking for datasheets for ESC's that I couldn't find any specification of the update/pulse width. The only thing I could find was Castle Creation (one of the top brands of ESC's) has announced an upgrade to their firmware that should make their ESC suitable for multirotors.
So I could ask the same question to retrolefty:
How do you know that the standard servo update/pulse is within the specifikations when there is none. ? 
<- smiley
I think (I presume) that this standard servo specification goes back to the good old happy days of ppm TX/RX.
AFter we have got all the pcm/spcm/spread spectrum technic it seems like vendors are more relaxed about the specifications.
for example if you look at the Spektrum DX8:
http://www.spektrumrc.com/Products/Default.aspx?ProdID=SPMAR7610
it states: High-speed 11ms frame rate.
And although there has been numerous complaints with this system, if have not heard of any having trouble with their standard ESC.