I can't really see how that's related to this request though, but feel free to open a new feature request, for a multi-input append node :)
You can use Component mask for swizzling

I see what you mean Lionel, but, what do you mean Chris?

Brian - could you try it again with 0.19?

This has now been fixed in the coming Beta 0.20 :)

I found the issue! The multi-add node has some broken logic causing it to output a pending type instead of a vector3. Thanks for the report :)

Can be solved with Robert Briscoe's response below

The Beast implementation seems more and more hacked in. Unity could use a proper lightmapping solution, this is just an interface design nightmare.

I will have to add a console to SF that displays warnings like this

Fixed in 0.20