Mike has exposed a second timer called "timercb" that can be use in your code.
see here in the docs https://docs.google.com/document/d/1EiYugfu12X2_pmfmu2O19CcLX0ALgLM4r2YxKYyJon8/pub#h.wozg1fyepkg2
and this thread... http://www.esp8266.com/viewtopic.php?f=43&t=10749&hilit=timer