IMSEXT.DLL Parameters (Exchange 5.5)

Dose anyone know of any other configuration partameters for the "OutBoundAppend" regisrty entry that goes along with the IMSEXT.DLL. For example I think most everone that has used it is familiar with '\par' which gets you a blank line and '\b' - '\b0' which turns bold on and off; I'm looking for any other configuration parameters that may be available. Thanks in advance for any help.

Jay