I think a timer would be cool because if your in the car, or bus or even school you don't have a stackmat with you..
Anyway: it worked on the Sony Ericsson W200. The way I managed:
- on your pc, go to
http://m.cubing.dk/
- click download
- unzip the files
- copy the .jad and .jar files to your phone
- in your phone, navigate to the files, and select "install"
you will then need to point to a folder where you want to install the application, and then you're done.