Hi all, and sorry for late reply.
Thanks a lot for hints, suggestions and endorsements, here and on
proposal's page. It was important to know, that Wikisourcians see
potential in those tools too.
Aubrey Cropping tool of Italian Wikisource was very helpful, and I
didn't know about it. I was
Happy to know that you like cropping tool and that you find it useful. I
agree fully with keyword temporary: time is always laking, but we see two
ways to develop it, to convert such temporary trick into definitive,
separated files:
1. to use coordinates of image relative to image page to crop