you can make it what ever size you want, you can also controll what directory gets what .htaccess file to controll specific directorys… exct.
this one says it all.
http://wordpress.org/support/topic/56654
as for changeing the “form”, you may not have luck there unless you add a new class…
make a file called ” .htaccess “
insert these values useing, say, text edit…
php_value post_max_size 110M
php_value upload_max_filesize 100M
php_value memory_limit 32M
php.ini does not work like you would think…i have had better luck with the .htaccess