We use multiple inline relations in our installation with the most complex configuration being:
Content Element
=> inline child record of table A
=> inline child record of table B
=> inline (grand) child record of table A
Since the introduction of $GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['l10nmgr']['inlineTablesConfig'] it is possible to use it in combination with tca select fields to configure both the Content Element => table A and Content Element => table B relations, but not the table B => table A relation.
In order to use l10nmgr with the table B => table A relation, we implemented a patch which is applied in this minimal reproduction example: https://github.com/adamkoppede/l10nmgr-inline-relations-example
Is there currently a solution within l10nmgr without patching? If not, could l10nmgr offer such ways to implement relations as described above?