add 'text' fields to list of 'Image source' to create Intro

hi
it will be cool if custom text-baced fields also will be used to search images in category blog mode to create Intro image.
for example, i use plugin to create thumb image so i add custom 'Teaser' text-baced field.
but this thumb have not links to article...
of cose, i can insert plugin sintax in main text but it break the beauterfull idea of text fields with plugin prefics.
so i think what add search options for text fields (AFTER content plugins did works) will be nice
(the native image field is not suitable for me in this case)

thanks for cool component and sorry for my English