Extend the passcode lock timeout on iPhone 4S and iOS 5 connected to exchange Preface

I have an iPhone 4S running iOS 5 and to prevent Find Friends from asking for a password every time it is opened I have enabled the passcode lock and set it to the max of 4 hours. This is fine as in reality it means at most once a day BUT it is now connected to our works exchange server which apparently is aloud to force the iPhone to remove the 1 hours and 4 hours lock options meaning I have to put in the passcode lock almost every time now which I do not like.

Attempts to fix

I have tried several tricks I found which apparently have been "fixed" by apple like disabling the exchange, changing the lock to 4 hours and re-enabling the exchange but this doesn't work any more.

I have found a few older posts about changing the "maxGracePeriod" in some of the iPhone config files like this post: http://modmyi.com/forums/member-written-iphone-news/700148-extending-time-passcode-lock.html#post5480817

So I jailbroke my iPhone and using iPhone Browser on my PC connecting to my now it and also iFile directly to look for these files but it appears that ether they have moved the files or my iPhone doesn't have this file.

Question

SO:


How can I remove the restriction Exchange puts on my iPhone of 15 mins max before the passcode is required?
OR maybe remove the requirement for Find Friends to require the passcode lock at all (I will amend the question to reflect this if this is the final result)
It appears I was slightly half wrong! The above mentioned post is correct and I managed to find the specified directory:


/var/mobile/library/configurationProfiles/PublicInfo


but only with iFile (not iPhoneBrowser). So I edited the files mentioned: "change maxGracePeriod and maxInactivity to 14400 (it's in seconds, not in minutes) in the files EffectiveUserSettings.plist and Truth.plist." and after a re-spring "4 hours" appeared as an option! Also I can now see that directory in iPhoneBrowser (may have been a fault?)

Hope this helps someone else!