I guess I am confused. The Omnia is very usable, out of the box, imo. The ability to tweak is a love of mine, but not a requirement to use the device.
As for iContact, it became the system default for Contacts for me. However, you could always use something like Keyswop and remap your soft keys, one of them to iContact.
For example, this is my setup. Contacts (icontact) on the left, Calendar (thumbcal) on the right.
