Edited –
update-1: I just saw a fix get checked in for the upcoming 1.1.1 release (next week).
update1: the dev team researched this situation and found a mechanism where sms: URLs work when opened from a webapp launched from the home screen, i.e., an iphone webclip. What is not clear yet is how to generalize this mechanism for the many possible contexts of MobiOne. Will keep you posted on how we plan to resolve this and a timeframe.
Wayne
Genuitec Mobile Team