[Q] Setting minfree but it has no effect? Also, permanent oom values?

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http://forum.xda-developers.com – I recently learned about how I can tweak the available memory using a minfree manager, so I downloaded one, set the values, tapped on apply, it requested root, then said OK. Now, I can't seem to notice any changes in the available memory, because no processes are shut down, they stay in ram as usual. Even if the free memory goes below my specified empty app minimum, android just sits on its ass and does nothing. Why is that? Another thing: Can I somehow assign permanent oom values to processes? There are some apps that allow me to set them, but after a while they just revert back to default (HowTos)