Most companies (or is it standard Android?) pop a message saying that by setting up EAS access you give them permission to remotely wipe the device. By the way, I feel like they may be in the right to want to wipe the entire device, they don't know what kind of IP (owned by them) you may have saved on the device that you could then disseminate to people outside the company after you leave.
It sounds like you're rooted. I would be VERY careful about using a rooted/ROMed device on company servers, if they implement a security solution that polls for the OS version and only allows certain versions based on the device you can be bumped without warning. Using a ROM also opens potential security holes, the company will have vetted the standard OS (as deployed by Google/phone manufacturers) for security, which is why they may bump a non-standard OS.