Some people will probably want the customizable text shortcuts available in SB2.

I'm going to leave this out of SB3 for now.  There doesn't seem to be a big
demand for it.

Idea from Ian Elchitz via the forum:

"Sure would be nice if we could define our own .commands to send text to ATC.
Text control is hard at times and this would make it easier if I could just
modify a text file that allow my own alias'.

Since opening a SB3 menu "pauses" the sim - using a menu will cause MAJOR issues
for people on final communicating with a text tower - especially in higher
traffic areas. "

Ian raises a valid point, I believe. In high traffic situations an FS pause
could cause a huge problem for ATC sequencing, and an alias file, such as
implemented in ASRC, is a great idea.

SB3 pauses when you open it as a window? I don't have that problem... Do I? lol