I just checked that this is possible to use HTML in signatures.
ISSUE 1:
there is no info about the possibility to use HTML - as a comparition I can say that "Private notes" have this PopUp message: "..... You can use HTML"
ISSUE 2:
I use this:
AutoIt MVP<hr>Regards,<br>mLipok
this is inproperly displayed on the forum. as "mLipok" is cutted.
Please follow it to the Lithium DEV TEAM.