Besides restucturing the config options for fields (see T275264: Rework field configurability in the details step), all other configuration options should be reviewed:
- Is the option needed at all?
- Is the name reasonably good?
- Is the default value good?
I've already made some notes in this regard here: https://www.mediawiki.org/wiki/Extension:MediaUploader/Configuration
This should all be done before the initial release to reduce incompatibilities later.