I sense a strong hint of toxicity here. Regardless of what you may think, this isn't 4chan. I'll just end this conversation here and post an update if I learn anything more.
EDIT: From what I can see after searching around.. [timg] is a BBCode tag that is exclusive to vBulletin forums. SMF does not have this functionality by default and I am unsure if an add-on exists to enable such a thing.