Customize / Edit Ringtone for Incoming Calls and Keyboard Shortcuts for Voice

Our team is a month in to using Zen Voice. We would love to be able to change the ringtone for incoming calls. Our reps have nightmares of the default ringtone after work away from the phones. A choice of ringtones or being able to upload our own ringtones would be fantastic.

Also, do you think it'd be possible to give us some keyboard shortcuts for Voice? For example: hanging up.