I can only think of /script/addons1/Interface_x50.js,
which isn't needed without the changes in main.xml.
There is another approach if you can spare the time please:
create a folder /Beta/ in the root of IM
putting in a file "user.config" (template is user.config.650)
with just this two (4 with comments) lines in user.config
Code:
// what to log and what not, possible values are: all, trace, info, warn, error
config.defaultLogLevel = "trace";
// where to log
config.logFile = "/Data/prsp_script.log
and post prsp_script.log