I too would like to see simul ring allow more ring locations.

I would think many users would like primary + 2 (at least)
Home(primary) + cell + other (office/other parent's cell/vacation home).

I have signed up for GV, but have not tried to simul ring VOIPO to GV for the reason
of too many voicemail systems. Cell and VOIPO is enough - I do like some of the
features, not limited to number of simul rings. Capability to connect to VOIPO
from another phone and dial out using VOIPO number in caller ID would be nice, like GV and (now defunct) ATT CallVantage have.