In the 'Module Inserter' GUI, keep the window open when I click on a preset, as I may want to edit that preset instead of selecting it!
Because of this, put some visual indicator in the GUI indicating which preset is currently selected along with a button to define the selected preset.

Thanks.

Perhaps the button to start the selection tool can be removed from the shortcut bar and always started via the profile selection/editing GUI.

Thanks.

I've added an option to keep the gui open after loading a preset and the button of the preset is highlighted.

Removing the shortcut bar button would enforce using the hotkey to get the selection tool. You can just configure your shortcut bar to not show the button.