Custom Runner and INFORMIX-Menus (Fourgen Menus)

Hi all, I have been using INFORMIX-Menus as user interface for running 4gl programs. Know I have switched to Dynamic 4GL (Formerly 4js) and I would like to stay using such interface for the character-based terminals. The main problem is that I haven't found a way to instruct to menus that use fglrun instead of fglgo. Anybody knows how to use a custom runner with INFORMIX-Menus (Formerly Fourgen Menus) without using the system command. I mean, Menus has a command named ifxscreen for running informix programs either .4ge or .4gi. I would to use the same command but being able to specified, maybe using an environment variable, my runner's name. If I be able to do this, I could specified fglrun as my custom runner and deal with .4gi/42r extension. At this time I have tried using a system command and it works fine, but I would need to change around 500 files that are already using ifxscreen. Thanks in advance! Ing. Melvin P'rez Cedano Vicepresidente T'cnico CAM Inform'tica, S. A.