In my 6 years working with Horizon/View I've never heard of a major KMS issues. There are customers that run redundant with SRV records that you indicated, but KMS does a pretty stand up job and I've never once had a customer have it impact their environment.
Not saying it couldn't be a problem, just saying I think that's why it's not a priority...it "just works" 99.9% of the time from my experience.
Normally activation issues are related to customers accidentally using MAK, which is not supported.
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Jack McMichael | Sr. Systems Engineer
VMware End User Computing
Contact me on Twitter @jackwmc4