Yes, there is an option in PSiNT's eFile Manager (you can download a trial version) which deletes unwanted temporary files. I suppose these are what you mean. I've done it several times, and at least I can say it doesn't remove anything it shouldn't!
i'm having trouble finding out a way to uninstall the trial version of ringtone studio (by wildpalmz) in my 7650. i can't find it under the apps manager and even in my file explorer app. do you guys have any suggestion or does the app uninstall itself with the trial period is over? :cry: