After conceiving the idea to write a mod that does what I want and eventually decided I just don't have the time to look into what it would take to do it (let alone actually write it), I figure next best thing is to either ask if it already exists in some form or share with the community in case someone wants to run with it.
So, the problem: dps wants/need to track their damage output. Raid leaders and tanks want them to watch the threat ceiling instead (while not falling behind on damage). Omen shows you more information than you need and your damage is somewhere else.
My idea: one bar with text superimposed over the top. The bar fills and changes color based on threat level. This bar ONLY evaluates your threat versus the tank's threat (a bar to agro gain), or when tanking tracks your threat versus second in line (bar to agro lost). The text super imposed can be dps, total damage, tps, tps vs tank tps (time estimate to agro gain), etc (text should be configurable for the user).
Ideally, this is less information to track without sacrificing feedback. Too many players can't be responsible for low damage because they can't/won't pick their name out of recount and so miss the real time feedback on what works versus what doesn't (and you know these people aren't exactly reading theorycraft threads to maximize their damage). Or you have the dps whore that jumps the gun and kill himself and the raid for the sake of a big number that can't be bothered to pick his name out of omen.
I hope you see where I'm going with the idea. My vain hope is that it already exists and it's just not something I've heard people talking about and I can spread the good word. If not, well... as best as I know you can't configure omen and recount to only show you the information that a base player should be interested in (raid leader is a different scenario).