If you have a registry editor, it's pretty easy to tweak those settings. Unfortunately, you're on a Lumia so right now that's not possible (we're working on it!)
The only other option I can think of right now is to try intercepting the communication between the phone and the corporate server. Exchange ActiveSync uses HTTPS, so any standard HTTPS proxy (like Fiddler or Burp Suite) should work. You may need to set the proxy to use a client certificate (if one was provided for your phone), and you definitely need to install the proxy's certificate on the phone (so the phone trusts it to spoof the corporate server). Anyhow, once you have interception set up, it should be pretty easy to modify the policy rules that get pushed down.
In either case, though, the changes will only last until the next time the phone checks its policy rules. I don't know how often that happens - it *might* even be only at initial enrollment, in which case if you un-enroll and then re-enroll you should be fine - but it could be a problem.
Win8/Windows RT projects:
List of desktop apps for hacked RT devices
Native Access WebServer and Libraries
WP8 Interop Unlocks
Storage Cleanup tool
XapHandler, Root Webserver, OEM Marketplace XAPs, Bookmarklets collection (Find On Page), Interop-unlock hacks.
Do not private message me with questions that should have been posted on the forum!
Not only are you wasting your time - I'm not going to bother writing an answer to such a question for only one person - but I will probably block you from PMing me in the future as well.