Problem with Slug/URL with same subpages

[yojoe]

In case GetSimple solves this issue, please update to this thread. I know its difficult because you need to change the whole algorithm of saving and reading posts. Still I'm a big of this CMS

CMS'es you have mentioned prevent editors from saving articles named the same as one of already existing article.
Some CMS'es will automatically add a char by the end/at front (mostly article's ID), some will show an alert and will prevent article from being saved.
Other one will base on article's ID in url, thus there won't be any problems with duplicated names.
But then you'd come up with: "I want to have SEF URLs".

If you still have a problem with that, just add current date to URL when upon article creation, or add a small piece of code to GS article save function, to make this process automatic.