Current UI:

• Allow reordering of custom properties in ways that make the most sense to an artist
• Allow editing from the sidebar
• Decrease the space between properties
• Using an 'X' icon to delete
• User and edit icon instead of "Edit"
• Better location of icons
• Group properties by the selected object/bone (see image)
• Add a drop-down to select the data type
• Allow the use of checkboxes to represent booleans