yes, there is a way too change the start button text by altering the registry.
There is however a few problems. You can only use up to 5 digits and you have to deal with the regitry. Anyway the following link will give you all the information you need to change the text on the start menu.
Just make sure you back up your registry before you start messing around in there. You can do some serious damage, and if it's not backed up you're screwed.
Or you can use a program called "resource hacker" to modify the name of the start button in "explorer.exe", and use as many digits as you like (if I recall correctly - it was a long time ago that I last did this.
Don't know if it works though, but as long as you have everything backed up (ie, copy the original explorer.exe to a safe place before messing with it!) you should be fine.