Visual editor can show non-visual tags. You should choose "Show non-visual tags" item in drop-down menu of visual editor (left-top corner of visual editor). Or if You want to set the showing non-visual tags as a default behavior of visual editor You can check "Show non-visual tags" option in Preferences of Visual Page editor.
Thanks for that. I'd assumed that that setting only applied to tags like <a4j:support>. Nice to have it working though :-)
hmm - maybe we should name that menu something different.
Atorble - could you open a jira with a sample file and possibly screenshots before/after illustrating it so we can remember to take a look at it ?