The RAZR is quite locked down. I tried to create a better UI for it [this was several years ago when I had a RAZR. worst mobile UI ever] but the problem is that the only way in is to create a java app that has to be launched by the user. This java app is hidden deep inside the menu system your trying to fix.
Nokia S60's on the other hand are a dream to customise. I'm working on a new application launcher for my E61 right now and the difference is stagering. Being able to run python on your phone rather than java or C++ makes development tolerable. Hopefully nokias widgets coming this year will allow access to phone APIs from JS/CSS/HTML, then mobile will be as easy as web apps.
Nokia S60's on the other hand are a dream to customise. I'm working on a new application launcher for my E61 right now and the difference is stagering. Being able to run python on your phone rather than java or C++ makes development tolerable. Hopefully nokias widgets coming this year will allow access to phone APIs from JS/CSS/HTML, then mobile will be as easy as web apps.