i have ride cymbal and a splash cymbal
can i possible put the splash cymbal upside ontop of the splash by using one of the spacers pads?
and would this affect the life-time of the splash cymbal?

Yeah, you can do that. If you don't smash the splash cymbal like a lunatic it should be fine.
A dwarf might hear you. What then?

My Music
You can, but i doubt you'll get the "full" sound of the cymbal....as a fellow drummer, my recommendation would be to just get a 2nd cymbal stand and have your kit sound that much better.