JDE job scheduler

We are using the job scheduler in JDE.

However, the jobs are being scheduled based on specific time(s) of day but there are instances that my company's Operations area is having Production or technical issues and things/events are running behind schedule.

This means that perhaps I may not have all my business transactions posted yet to the JDE tables by the time the scheduler runs my job(s).

Is there any means to make use of an external event controlled by some other system that would then start the scheduler to run the job(s)?

Perhaps we can always have the scheduler server stopped and some external event can then start the scheduler server which would then determine if the job is late, at which point it would begin its execution?