If you use a symbol font where regular characters have been replaced instead of using the appropriate unicode it should work. You can try the default Windows Symbol font for example.

Note that this means you cannot really see what you are writing in the text input box, but if you combine with the Windows Character Map program, you can find the correct letters.

No options like that are available for this forum software unfortunately, neither by default or as a plugin, so I wouldn't be able to do that without resorting to writing the plugin myself.

The avatar does show a little larger for the first post in the discussion, and of course even larger on your profile page.

It's been deleted. Give me a word if you still have problems editing your profile, the forum may cache something that needs cleaning.

Seems to be an oversight in the template. I'll mention it to ProFantasy to look into.

I don't think the edit option works on lines, only on polygons.

The color is the view window color. You can change it from the View menu