[Q] system partition

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http://forum.xda-developers.com – I have flashed MIUI and seems like they have used all the system partition. now I have deleted some apps I dont need but its not enough and it seems that there is some apps I cannot install to SD cos they wont be working, I have heard that you can somehow make some of your SD be part of the system partition. is it really possible? is it recommended? (HowTos)