I would recommend not mixing it in total time at all, many employers do not want to see that.

We probably all have a sim column from general aviation sims, Frasca, etc. If you need to log level D, then I would create a separate column just for that... if you need to meet ATP mins, they'll have to sign it.

It might be hard to consistently log level D in your personal book throughout your airline career... it's not required per the airline (as it is logged in their records). Many instructors will not want to sign your book since there's no upside for them.