Grand Pause or Caesura
In many forms of music, there can be found a Grand Pause denoted by the caesura mark. Composers often use these over fermatas for various reasons. Often I find it more suitable depending on the definitive amount of time you want the music to be paused.
Comments
This is already supported. See the Breaths & Pauses palette. If necessary, be sure you are in the Advanced rather than Basic workspace (see control at bottom of palette window).