Yes I do agree with Akshay custom post type feature is mandatory as I received same demand from different clients as well.
By the way we have added checkbox functionality in same plugin to achieve one of our client's requirement. Héctor, if you say I can share that code with you so others can get helped, we have added feature in shortcode so when user will enable that checkbox from shortcode (by adding attribute) then it will work otherwise checkbox won't appear on edit post page. :)
I appreciate you have created excellent plugin which helps us a lot!!!
Today I am facing trouble to resize image on 675x457 and its showing results at 675x198 which is weird :/ I also tried to use "thumbnail_selection" by adding following code in functions.php but failed. :(
// Enable post thumbnails
and I also tried to change featured image dimentions from functions.php
define( 'HEADER_IMAGE_WIDTH', apply_filters( 'twentyten_header_image_width', 940 ) );
define( 'HEADER_IMAGE_HEIGHT', apply_filters( 'twentyten_header_image_height', 198 ) );
I hope you or somebody will be around to look at this post and help me as I have to fix this issue within next an hour.