Nev & Chris
I have several customers using different variations of the Brocade VDX6470 with excellent results.
You didn't include a complete model number for the switch you're using, but the 2 settings you're concerned with don't appear to be accessible on the VDX line? I've checked our documentation, as well as Brocade's and I can only assume these features are now automated by the switch.
For example, our networking best practices do suggest disabling Unicast Storm Control on older switches that support this feature. However, I can't find any mention of these settings in Brocade's technical documentation?
Even so, as I mentioned before, I have a handful of customers (one even makes use of the QSFP+ ports on the VDX 6740 for connecting the Nimble 10Gb iSCSI ports on a pair of Brocade VDX 6740's, which reduces the number of ports utilized considerably.
So, I'd have no hesitation in recommending the Brocade VDX6740's for use with Nimble. They're easy to setup and blistering fast.
(Lastly, always check your firmware ;-)