The reason to ask is that I'm using external picture hosting on the rest of the forum.
The consequence is that a user can add images in the post itself (and resizing is done automatically by the picture hosting).
Therefore the "Add Picture" screen following in step 2 of the listing is confusing. Setting image size to 0 isn't a solution because the user then gets an error message which is confusing too.
If it were possible to disable "Add Picture" in the SMF Classifieds settings that would be great.