Widget: size of thumbs also showing manually added ones or allowing custom size

Hello,

i added in my functions.php an extra filesize for the thumbs of the sidebar: add_image_size( ‘sidebar-thumb’, 60, 9999 );

with the add_filter( ‘image_size_names_choose’, ‘my_custom_sizes’ ); i could also add them to my media editor.

can you also add them to the widget selection?

or, maybe even better, allow to enter custom size (as 60px x 60px).

i think most people will need here an additional size that is not covered by thumbnail, medium, large, full

thank you very much
sofian