I've worked with Stephen, the developer of "TotalSpaces", before it was acquired by BinaryAge ("TotalFinder"). There is a beta for ver. 2 that is available for use on 10.10, and it's quite literally exactly like "Spaces" pre-10.7 when Craig Federighi took over from Bertrand Serlet. You can fully customize it, place app's in any space, create gesture's and/or keyboard shortcuts, and works perfectly with multiple displays. That and "Control Center" from Cindori seem to make 10.10 much better, although I miss pre-10.7 OS X years.