I believe the unit is always pixels. and for something like Max Fall speed it's Pixels per second.
in the case of the properties bar, at the bottom is the properties descriptions box.
link to manual page that talks about it
This gives info on each item.
Don't know if this fits the bill perfect but it's the first idea that came to mind from your original post.
in short.
on click sprite.
Turn off all sprites
Turn on the one clicked.
example .capx
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Nice example Yann.
Repeated Noga's steps and got the same result and error message. Ignore,retry or Abort all result in Construct 2 crashing to desktop.
win7 64bit
560ti.
Develop games in your browser. Powerful, performant & highly capable.
Very nice. Thanks for putting it together and sharing.