Currently you can add multiple filters and drop-down (including the new dynamic drop-downs) to the top of a panel. In order to help my end-users there's often a logical order to these filters, often going down in granularity from left to right. If a request is made to add a new filter the only option at the moment is to add it to the right. Considering everything else in the project is drag and drop to move/rearrange can functionality be added to all the panel filters/segments to be dragged around to change their order?
The only option at the moment if you really want the filters/segments in a specific order is to delete them and re-add in the order you want.