If your idea of a marriage system is one chat command sure. There's much more work than you seem to think especially if you want the system to be great instead of mediocre or worse.

1. Creating a GUIs to initiate and manage your marriage.
2. Scripting a ceremony, and creating the graphics and effects that go with it.
3. Creating items, updating scripts to take advantage of the marriage as well.
4. Scripting divorce functionality into it as well.
5. Thorough testing to make sure it all works.

Setting clientr.partner=account isn't the hard part it's creating the content around the system that takes the time and is the difference between being a good update and a mediocre one.