To allow to make templates which will look very different from each other, the pages builders (at least the home page builder) need to work not only with columns but with rows too.
For me, the ideal page builder will ask first for the number of rows in the page, then the number of columns in each row.

Alas my knowledge does't allow me to build such feature by myself :-( All that I can do is to hope that Boonex team will hear me, or to wait for some miracle :-))