Nice work, Sia!
@ Cyko,
your design idea lacks some of the features offered by this version of the dialog. You might want to create a new revision of it...? Because the general look'n feel of your dialog seems good to me, however, if it offers less functionality, it is unlikely to be chosen for implementation.
However, sias dialog currently lacks the possibilities to use intervals (except for 1 week intervals), so you can't do something every 13 days for example... Even if this is not very important for most users...