There are a couple of problems with that.

Companies like Meridian and Lexicon have the in-house expertise needed to create and refine surround processing technology. They've been doing it for decades. In contrast, Dolby had to go outside the company and hire Jim Fosgate to design Pro Logic II.

Does Outlaw have any expertise in this area? Have they ever designed surround processing. Or, like every other A/V manufacturer, do they simply license this sort of technology from companies like Dolby and DTS?

And even if Outlaw had the know-how to change the PLIIx algorithm, doing so would violate their licensing agreement with Dolby Labs. Keep in mind that it is a licensed product. Changing it means you can no longer call it PLIIx, assuming Dolby even allows you to mess with their code.