useImplicit in chtMultiRegionFoam where temperature equation exists

Functionality to add/problem to solve

I have ported compressibleInterFoam into the fluid section of chtMultiRegionFoam to have a two-phase VoF solver with conjugated heat transfer.

The solver will work with explicit boundary coupling. However, it would be nice to have the useImplicit feature available when working with T instead of he.

Is there any reason for restring the use of implicit coupling to the he field?

Target audience

All people interested in using TEqn for conjugated heat transfer instead of EEqn

Proposal

(How are we going to solve the problem?)

Since boundary conditions are specified for the temperature field, solve for T on the background and allow the direct use of TEqn in the coupled approach?