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Could be a long post, so hold on!
This is experimental and not tested and might only work in theory.
1. you need the latest orginal tinyMCE editor from tinymce.moxiecode.com, download it and extract the package
2. copy from plugins (somewhere in the folder structure) the folder bbcode to place where the plugins are located inside tinyeditor
3. edit tinyeditor / include / initcode.php and change from:
echo '",';
echo "themes : 'advanced',";
to:
echo ',bbcode",';
echo "themes : 'advanced',";
and from:
echo 'debug : false';
to:
echo 'entity_encoding : "raw",
add_unload_trigger : false,
remove_linebreaks : false,';
echo 'debug : false';
What happens now is, that i.e. [ b ] is converted to strong when you are in edit mode and when saved converted back to [ b ].
To make it as a configurable options for groups is a bit more tricky and to be honest: I don't know if it works for you, but it is worth a try I think, so GOOD LUCK!