Transaltor Role: Provide access to the edition engine (read-only in non editable lang and write on active lang)

The current translator privileges do not allow him to open edition engines. Then it prevents the translator to translate metadata (e.g: description or other fields added there), check the current workflow role or setup the SEO in the lang to translate.

I added the access to such edition engines in the Admin Center> Role menu, but despite having the permissions on JCR_modify_portperties_default_FR and access to certain enginesTabs, all tabs in all lang (including FR in the current case) are in read-only mode.

Possible to access the edition engine in read-mode in certain lang and write mode in another? Or to only let the transaltor access the edition engine in the current lang (no lang switcher or only with the allowed lang within the engine)? At least it will allow him to setup all the advanced translation options, check the workflow rules for transaltion, etc...