I added a new BBCode tag: RIMG (resized image)
It works exactly like IMG, but it doesn't break the forum's layout. Right now all posts on the forum are reparsed, so the tags may not work for some time (hour or so).
If you wish to have your post updated immediately, just edit it and confirm the edition (with no changes to the post) - the BBCode will be parsed in this post and all tags will work.