In version 5.4.x I can specify (to a point) in what order the available blocks are displayed in the "Add Block" popup. Specifically, I can sort them by name by adjusting the btNname (and the btDescription) in the "Block Types" table and then just sorting by btName instead of btID in block_area_add_new.php. Worked like a charm!

I just tried doing the same with 5.5 but the changes aren't displayed.

Any idea where I have to look for this now?