AssetIcons can be configured in the Unity preferences menu. This configuration is per-user and per-project.
The first section of this dialog provides links for asking a question, reporting a bug, requesting a feature and finally listing all issues on the issue tracker.
Check for Updates
You can check for updates to AssetIcons from within the preferences menu. Pressing this button will open up a popup dialog (shown below).
Clicking on one of the versions in the Update Checker will open up the changelog hosted online.
AssetIcons can be updated from the Unity Asset Store.
Enabling and Disabling
You may enable and disable AssetIcons. This may be useful in collaborative projects where some users would rather not use AssetIcons, or for performance reasons it should be disabled.
Draw GUI Styles (Experimental)
Unity's GUI Styles can be represented as
.asset files in the project window. AssetIcons can draw a preview of these GUI Styles right within the project window.
I don't see this feature being used much, and so it's included here as an experimental feature.
You may adjust the resolution that AssetIcons renders Unity Prefabs to increase the quality of icons or increase performance with large amounts of assets.
You may customise the strength of the selected asset tinting.
You may associate file extension types (
.cs, e.t.c) with icons to customise your Unity editor experience.