Customising a custom rom I want to know is it possible to edit a custom rom from zip and then zipping it again (flashable) to a device.  Will it brick the device?
Thanx
Depends on how the ROM is packaged and what you change in it before repacking. You should be able to unpack and make edits using suitable tools for unpacking the ROM.

A better option is to first flash it, then root and make your changes in the files as needed :-)

And yeah it can brick the device if you flash bad code