I was strictly talking about the SV set... and applying SrS with Multi on a raid boss seems to be inefficient use of focus.

*Edit* I saw what you are talking about the multishot portion in the spoiler... but is it worth it to use Multi shot on a single target boss vs serpent sting?

I haven't been using Dire Beast as from the femaledwarf it has a lower DPS yield, and I've read several forums about how there is a delay in attacks, and when the boss moves that also is also a minus in DPS. Fervor is what I'm using right now.

I'm not sure that I have much confidence in your sim results as general consensus has been that DB is the highest dps talent in that tier, both in terms of the simulator and real world expectations. It is absolutely true that real world DB sometimes (but not always) underperforms theoretical expectations, and research into that is ongoing. But the attack delay you have read about (perhaps including my own posts on it) doesn't ever drop more than 1 attack in realistic circumstances. If you're firing DB at a time where extensive boss movement / phase changes drop more attacks than the 0-1 lost to the initial delay bug or pathing twitch, you're using it wrong.

Meanwhile, the difference between MS and direct Serpent application is mostly moot. But during DB (or, sure, Fervor), it's a race to avoid focus capping anyway, and the extra damage from MS can be re-imagined as a 60% weapon hit, off GCD, for 15 focus. Which is good -- we'd use that button if it was a real power. If encounter mechanics make MS suboptimal, or the energy cost really bothers you for some reason, that's almost certainly the deviation from optimal behavior that would have the least real-world impact.

Following that more and more abilities are being fixed in regards to Thrill of the Hunt, will it be a worthwhile choice?

It saves you the global every thirtieth second, andI'd say easens up the tight-ish rotation for all specs a little bit, and with these fixes it could actually win out in the end? I haven't done much testing myself on it, but I do know that in its pre-fixed state it was almost as good as Dire Beast, and perhaps better on some movement heavy fights (Which Pandaria contains a lot of).

For those who haven't read about the fixes yet, here they are:

Kill Command, Glaive Toss, and Powershot will now properly activate Thrill of the Hunt.
Scatter Shot will now properly break when damage is dealt by any source.

I am thinking that it will be more of a buff for BM, since we use that Kill Command a lot, but the fix for Glaive Toss is also much welcomed for all the other specs.