Should route dial patterns support / caller id syntax?

According to the asterisk config extensions.conf information page on (, it should be possible to use something like:

exten => 123/100,1, …

This matches a dialed number of 123 if the caller id is 100.

Should this syntax work in FreePBX for the Dial Patterns entry for outgoing routes? I was hoping that this would allow me to easily limit outgoing routes to one extension without having to manually hack the configuration files.