Apply "Floating/Translucent Window" to all existing sticky notes?
You can set Floating Window as the default behavior for all new stickies, but for existing stickies you will need to set this value one-by-one.

To set the default:
On one sticky (any sticky), click Note from the menu bar and set "Floating Window" and/or "Translucent Window" to checked.  Then select "Use as Default" from the same menu.



All new stickies will have the new settings.  You can turn these off on a sticky-by-sticky basis, or you can re-set the defaults using the these instructions.