LibreOffice allows aligning objects to geometric center of the page but choice for optical center is missing. Optical center is different from geometric while it has greater use in typography and content presentation.
Aligning manually might be quite difficult especially for inexperinced users so adding this feature would highly improve usability for works requiring profesional looking design.
Thanks for new idea
But what is optical center? How it differs from geometric? Please, give link to explanation or explain.
To cite properly:
"Optical Center is the spot that the eye sees when it first encounters a page. The optical center is slightly above the mathematical center of the page. It takes a compelling object indeed to pull the eyes away from it. The optical center is the starting point." <http://www2.selu.edu/Academics/Faculty/galkadi/233/DTPNOTES%20modified.htm>
Optical center is closely related to golden ratio and golden ratio is afaik most used way to construct it. The difference between geometric and optical center can be seen on this picture: <http://www.pixy.cz/pixylophone/obrazky/zlatyrez3.gif> (optical center is green)
There are also some slightly different ways to construct it:
Following picture shows one of them: <http://antypa.cz/wp-content/uploads/2010/03/Picture-38.png>
One simplified method to find optical center is descibed at <http://books.google.cz/books?id=r5arjo6JSgQC&pg=PA29&lpg=PA29&dq=optical+center+typography&source=bl&ots=XoQBBNOU3r&sig=rj4Rm18HZcpco3sbXk5SGIXcLT8&hl=cs&sa=X&ei=QUB7T-urBobLhAfl881p&redir_esc=y#v=onepage&q=optical%20center%20typography&f=false>
Thanks for links. It is very interesting. Please, if possible, create and attach picture how dialog should look like after adding this option. It will greatly help while implementing this option.
This is an interesting one, I'm going to mark as NEW for the time being and put as LOWEST priority (since it's really easy to manually do this). I'm not sure if we'll ultimately do this as it adds a layer of confusion for users not as knowledgeable as you are but, it's an interesting point. Please provide attachments when you find the time.