I'm still trying to get any of them to extend a single desktop over to the second display. As for the 64bit 10.10 whether booted live or installed on anything other then a VM the screen flickers a quick look and minutes pass by before each other 2 second flash is seen.
For custom installs on flash drives for live boots the 32bit was the one since that does remain onscreen. For not seeing the full 12gb of memory however you wouldn't actually need to since you wouldn't be using up more then a few gig to start with being one of the small distros.
I trust that's the same synaptic seen at Synaptic Package Manager - People