Yes, you can reorder your toolbox sections by going to Administration > Settings > Advanced > Toolboxes > Toolboxes > PageControls > Sections. There you can set on each of your sections ordinal number (beginning from 0) in the order you want to appear on your sidebar sorted from top to bottom.
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items