.....To start off with I'll put the obvious:
WARNING: THIS TOOL MODIFIES CRITICAL SYSTEM FILES. I AM NOT RESPONSIBLE SHOULD THE WORST HAPPEN.
That said, you SHOULD be fine.
What is it? What does it do?
"build.prop modifier" is what it says on the tin. A free application for rooted Spicas that allows you to easily backup, modify and restore your build.prop. It is currently in BETA- I need testers!
Currently it allows:
Why? Well, changing the device name  FINGERPRINT...[/edit] changes what you see in the market, the DroidX option SHOULD open up the market to most apps. Note that that doesn't magically make your phone compatible, it just means you can see more.Backup of build.prop to SD card.
Restore of build.prop from SD card.
LCD Density changing. (120,130,140,160,180 and 200).
Changing of Device name from GT-I5700 to GT-I5800 or DROIDX (more to come, I'll probably give you a Custom option.)
Enabling and Disabling use of phone when there is no SIM inserted.
Change the Android version number (This allows me to run my games compiled for 2.2 on Android 2.1 with FE.)
If you could give it a try, let me know if it works for you or not, and if you have anything you know of that you would like to be added, you can also mention it here.
1) New release, a little clean up really. It's a mess anyway so it doesn't matter. http://www.damiensturdy.co.uk/bpm2.zip
2) Source code!: http://www.damiensturdy.co.uk/BPM_Source.zip
I'm happy to give the source code out, Though the codes probably the worst I've written in a long time. I'm not used to Java ;-)
WARNING: If you rush the application, it has been known to corrupt the build.prop file. Load the application, wait for it to get its permissions, then perform a backup, then make your choices. Be patient with it, because if you click things as fast as you can there have been problems saving files.
I will fix this as soon as I can get to a dev machine.
Remember, if you're patient, you'll be fine, and if it does corrupt, just restore your backup (you'll want to mount the SD card in recovery to do that.)
The bug isn't really what I wanted out of my first application, but it'll be fixed soon.