A99 w/studio strobes sync issues?

With respect, I disagree with your assertion that sync speed is a spec designated for speedlights.

Sync speed (or Xsync) has always been about the shutter mechanism and it's sync with studio flash.  Long before pocket wizards the xsync port was the common outlet for connecting a camera to studio flash. Of course it still exists now, but most people use wireless triggers.

A photographer using this port always knew they could use the maximum sync speed of the camera to sync with those lights.  I've not heard of a single instance where this is untrue.

Studio flash systems themselves have a short duration, and that flash duration happens entirely inside the window of the sync speed. I've been shooting all manner of studio flash systems for years, and none (even the cheapest, bargain basement poor studio mono's) would have any trouble syncing to the max sync speed of the camera.  No special anything required.

Flash duration on studio strobes may be longer than speedlights, but I am fairly confident that any studio flash units made in modern times have a flash duration well shorter than 1/250 of a second.

I'll conduct my own test shortly to see what sort of sync I can get out of the A99 with studio strobes. If it's not 1/250 as Sony states, they have some explaining to do.

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http://jamesogilvie.com (my portfolio)
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A99/A900/RX100 - a bunch of Zeiss glass and stuff.