Change to the coil lock out timer and myth tome system. Something like suggested in this thread:
http://forum.square-enix.com/ffxiv/t...ory-job-system.

The game really goes out of it's way to encourage you to play a single job per character, which goes against how the game was advertised and was intended(I think?) by the devs.

I would love to help out friends, gear up multiple jobs on a single character, and do all content on all my jobs on a single character. Currently, we can bypass this "barrier" by making another character for each job we want to level, but that defeats the entire purpose of the armory system.