Web page editor

Hi,
I am using the web page editor and notice that when the
template.html is changed in the editor, there is appears to be no way to re-generate the existing pages based on the
newly changed template.html

For instance to add more tabs on the menu, change the links,
add an image.

This makes changing the template.html at bit pointless because only new pages will be according to the new template and the existing pages will not have the changes.

I suppose the only way to use a changed template would be
to delete all existing pages, change the template and then
start "creating" all the pages you want from the new template.html

Am I missing something - maybe you do have a re-generate
method somewhere ?

Any thoughts on how to improve this ?