Prevent background apps from auto closing?

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http://forum.xda-developers.com – When multi tasks my apps have closed by the time I return. I use my nexus 7 for my text books sometimes I need to use the internet so I open my web browser when I come back to my book I have to reopen it. This is so annoying not only do I lose my place but any notes I made as well. From what I have read apps close after a few minutes regardless of how much memory I have and that no app will fix this as it is a hard coded kernel "feature". I am willing to goto any extreme means to stop certain APS from auto closing be it root with kernel, flashing ROM or installing an app. I d (HowTos)