Only one I've known otherwise is the strikethrough... but just went and found this list, maybe some (all?) of those work here?
https://www.vbulletin.org/forum/misc.php?do=bbcode
Not seeing an image scale though. Personally, I just put images in imgur.com and shrink them there first.
edit: Some might be admin use...? Not seeing where [warning] does anything on this end. lol
more edit: Oh, maybe this for images?
https://www.bbcode.org/examples/?id=10
Quote:
Resizing the image
[img=100x50]https://www.bbcode.org/images/lubeck_small.jpg[/img]
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Never mind, I attempted it but it doesn't recognize it.
Either way it seems to be BB Code, so maybe you can find a solution that I couldn't.