If you can modify init.qcom.sdio.sh and push it to the /systerm/etc folder or edit it directly from a file explorer in android, then you can add the commands at the very bottom (just above "exit 0") REMEMBER: as you are messing with the file system you take all responsibility, etc, etc, etc.
You would add the following:
chmod 0777 /system
chmod 0777 /system/bin
I would push it twice or edit it twice with file explorer (I actually edited it three times by first adding the commands -save. Then added a "1" after the "#!/system/bin/sh" on the first line - save. Finally remove the "1" and save again.) as it makes a backup and might try to load the backup.
After this reboot your phone and see if the new commands stick and make your /system and /system/bin writable. It might work, but I think we will have to take more steps to envoke the file to execute.