Currently if a meta-key is defined, switch_ivr_async.c waits for the bound key within 5 seconds (hardcoded). Also there is no way to send the * key further along B leg if it's assigned as a meta-key.

I made a small update in Wiki:
http://wiki.freeswitch.org/index.php?title=Misc._Dialplan_Tools_bind_meta_app&curid=2102&diff=29834&oldid=29071

Feature request:

1. Make the meta-key timeout configurable;
2. In case of timeout, pass the meta-key and the following DTMF symbol down to the B leg (currently only the symbol after the meta-key is passed).

This way it would be possible to use the * key for both locally bound applications and for IVR menus on the called side.