Here's something everyone can use to make registry changes easier:
http://ceregeditor.mdsoft.pl/
Download and install this program, it runs on your computer. Just connect using activesync and it will read the registry from your phone and allow you to make edits from your computer itself. I make so many reg edits that it's a pain to do it all from the phone.
Pro Tip: Make sure you go to Tools - Unlock Registry first so it will allow you to commit changes to your phone.
Also, you can save favorites and make cabs from reg entries etc, this editor is pretty nice.
Btw if you change the 5000 to 20000 and not do anything else, that'll be just fine. There's no need to change it Hex 4E20 explicitly, it's the same thing.
HTH.