Could an OOTB tool be created for enabling ST_GEOMETRY in mobile geodatabases? Either a geoprocessing tool or a tool in the right-click menu of Catalog?
Otherwise, it's a bit tricky to enable ST_GEOMETRY in mobile geodatabases for non SQLite experts. See Load ST_GEOMETRY .dll extension into SQLite/mobile geodatabase — Error: "not authorized".
We have a similar tool for enabling ST_GEOMETRY in enterprise databases: Create Spatial Type (Data Management). It would help to have a tool like that for mobile gdbs too.
Thanks.