no, only one __DATA__ is allowed. however, different perlmods are allowed different __DATA__s.
you cannot load them with a $var because they are compiled in in the BEGINning. I had the same problem. use this require $module; import $module; which is what use does except that its precompiled.
I don't think you can pipe pics embedded in HTML, if that's what you mean. But you can cache the pics (if the mod allows that) and send through when the browser asks for it. For this, you need an elaborate cacheing scheme. perhaps fastcgi?