How To: Custom Auto Check Time on MobileMail.app

I want to hack MobileMail.app so that I can have a custom autocheck time, instead of either 15/30/60 minutes.
If anyone knows if this has already been done, or how I would go about doing this, please let me know
Thanks!

Ok I managed to do it. Here's what ya do.

1. SSH into your iPod and go to /private/var/root/Library/Preferences

2. Download the file com.apple.mobilemail.plist

3. Convert the file (from binary) to XML with plutil. For those not on Macs (or are just lazy) you can use this script: http://140.124.181.188/~khchung/cgi-bin/plutil.cgi

4. Open the file with a text editor and look for <key>AutoFetchInterval</key>

5. Underneath that you will see something like <string>60</string>. Edit the number to something else, (i.e. 03 to check for email every 3 minutes)

6. Save the file and upload to your iPod with SSH. (You don't need to convert the file back to binary.)

7. Restart iPod

If this helps anybody, let me know!

If anybody figures out a way to hack the actual mobilemail.app to add custom options to the settings that would be even better!

Are you sure it is not

Code:

<key>AutoFetchInterval</key>

I changed the number under that between the <string> tags and it works, I tested.

Yes of course. Why the hell did I say RecentMessageCount. Infact, now that I'm looking, I don't even see RecentMessageCount. What the hell
MY bad..

Also, for 1.1.3, the file is located at /private/var/mobile/Library/Preferences.
I think i used the dev team jailbreak, so iono if that had anything to do with it. But I found the file there, kinda by happenstance. I looked in every preference folder =P

is this possible in 2.0? The only contents of this plist on 2.0 is:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>LastAccountViewed</key>
<string>8D675F48-09FA-431B-A4B8-961ED20E3365</string>
<key>LinesOfPreview</key>
<string>3</string>
<key>RecentMessageCount</key>
<string>200</string>
<key>SignatureKey</key>
<string>(my name here)&lt;div&gt;Sent from my iPod Touch&lt;/div&gt;</string>
<key>TableOffsetKey</key>
<real>0.0</real>
<key>UISuspendedSettings</key>
<dict>
<key>UISuspendedDefaultPNGKey</key>
<string>Default</string>
</dict>
</dict>
</plist>

is that the right plist?

i figured it out on 2.0 and made a guide. Its in 2.0 jailbreak.