There are also a ton of other reg edits that will help make it a little more finger friendly. I really like the tweak that increases the scroll bars. It makes using them much easier.
See here...
Increase Scroll Bar Thickness (for finger friendly) -
http://www.howardforums.com/showpost...&postcount=229
I would try spending a little more time getting used to the optical mouse. I have found it to be very effective once you get used to it. I would also suggest downloading the changefingermouse file that allows you to change between the d-pad and mouse settings using a hard key on your phone. You can find that on the first page here...
http://forum.ppcgeeks.com/showthread.php?t=51532
Also, have you tried Samsung Today 2. I like it A LOT more than any of the other standard options that came with the Omnia. You can find that in the first page of the above link for the changefigermouse tweak.
I was in the same boat as you when I first got my Omnia. I really loved the hardware, but did not like the "feel' of what it was running on. After a few days of reg eidts, tweaks, and downloads it's turing into a pretty nice device.
Next on my list is to play around with some of the skins out there. TF2D and SPB seem like they are worth looking into. I had the XV6900 and loved the touchflow app. Let us know how you make out.