Watermark enhacement please - really needed as soon as possible

Hi,

your watermark.scm is really what I need.
But can you please enhance it with the possibility to put the watermark centered of the picture ?

Or can you put a check box to allow keeping the watermark as a calque in place of merging it with the picture. If it stay as a calque we can move it where we want.

Sincerely thanks and have a nice day.

Miguipda ;-)