When one open the Add New Item dialog from a panel plugin right click menu, and add a new plugin item by double clicking in the item list or pressing the Add button, the new plugin item is always inserted after the plugin one right clikced on. When one open the Add New Item dialog by right clicking on the first half of a plugin, and add a new item, the new item should be inserted before the plugin one right clicked on. Reproducible: Always Steps to Reproduce:
Hmm, that doesn't sound very obvious to me. If you want more control over the position of the new plugin you can drag an item from the list to a panel. I don't think this feature has enough advantages to justify the work necessary to implement this, sorry.