Edit .ini via script on Android
By MC33, are you referring to Zebra MC33xx devices?
There is probably little you can do using Android+ script commands supported on the device as of now. However, if the .ini file is located in a directory that is accessible (i.e. with the required read and write permissions) by the device agent, then the best you can do is probably to use file-sync rule to get the file to your server, and then use Powershell script or other software tool on the server to modify the .ini file, and have this updated ini file sync'ed back to your device.
Out of curiosity, why are you having to also write to the .INI file? Do you have another application that is referencing that .INI file or is there another reason for it? There may be another method to accomplish the same goal depending on your actual use case.
I can't reveal anything more but this feature will be added in the Android agent in the future. Can't say when though.