Let me say, I'm aware of the new KK parameters that doesn't allow apps certain SD card rights. HOWEVER, I'm running a ROM w/ SD card fix enabled. I can successfully write to sdcard and, with certain applications such as ezPDF and Kingsoft, I can make changes to files on my sd card.
I can't make changes to files with my preferred office apps: Hancom or Polaris Office. Can we figure out why and fix it?
I'm guessing it has something to do with the permissions of those apps and/or what group (UID or GID) they are assigned to.