need to set timeouts for when I'm running with external triggers

bladeRF-cli and the python and matlab bindings allow me to change the default timeouts, but the gr-bladeRF blocks don't seem to be able to set those timeouts.  My project involves externally triggering the rx and tx channels with a trigger from some RF hardware that needs 10 or 20 seconds to get ready for a pulse.  How hard would it be to add those inputs?