Adding 2nd drive to 17R model 5720

I red everything that was said in this topic, so basically msata is only sata2? Okey can work with that, can it be that a 128 gigs msata would work just fine? For example it is said that this model works only with 8 gigs of ram, but i am currently using 12 gigs and it works just fine...

What are the chances that it would work fine?

And about that dummy slot, it just doesn't make any sense... Why in earth would you put it there with no connectors?? Just so you could make a SE edition and charge it more? Anyways it looks like a very bad idea..

I can get that carry for ssd instead of optical drive, and can that work well with a hdd? 

Again, its complete nonsense to remove my optical drive when i have a perfect slot for another hdd, just that dell didn't think it would be nice to put connectors there..