1. Yes, there is.
2. Check this Spectrum ROM out, it has Maxxaudio and COS camera, made by OPPO.
When I had strong signal strenght, I reached about 4.5-6 SOT (depend of usage).
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I usually reached 4 SOT max. Best is 4.5/5 SOT I had. (find7a)
The newest color os rom is really good with the battery life, ive gotten around 6-7 SOT with medium-heavy usage, this maybe part of me having the find7a with the 3000mah battery (from the find7s)
there arent any other roms that are not color os that have the same max audio however most roms come with a mediocre equalizer, or viper4droid (which can get REALLY good)
i think that Paranoid android had maxaudio ported from the 1+1