I agree that I would like a more practical rather than pretty inspector that takes less space than the current one. And checkboxes are fine!!!! In fact the more standard controls used the better (BTW IMO Xojo inc should NEVER create a new control JUST for the IDE... if they are going to create one then it should be cerated for general use- That is eating ones own dog food!)
Looking at other IDE's with Listboxes for inspectors one would initially say they don't look good and are too busy ... but they could easily look better...
I think a listbox based inspector would be best with the following suggestions...
Make the row Height a bit bigger than the default ... Just enough so it does not look too dense but does not table up too much space... i do that all the time to make listboxes a bit easier to read/scan and it does make the UI more attractive. That would take up a lot less space than the current one but still not look too dense... The row height could easily be made a user preference then.. I like some white space for readability but others might prefer more compact
Of course it should be hierarchical with sections headings being at the lowest level. In some cases (maybe position locks) groups setting could be a second level.
Each section header should be colored too stand out with different or alternating (for when collapsed)
One should be able to collapse all sections or or expand an single section optionally with it's subsections but keyboard or menu.
And of course it should be scrollable... and IMO the only things on the "gear" panel should be things like attributes, if even that... Certainly not fonts!
A listbox based inspector can look good, though it would not be as pretty and the current one... but it would be more practical. While looks do matter in they end they are not the MOST important thing... IMO anything that makes working in the IDE more efficient/easier is more important than being the MOST beautiful.