Better Hotbar customization

The way items on the hotbar are currently presented is basic to the point of confusing. It shouldn't be necessary to create LCD panels to explain the hotbar items; it should be possible to hover the mouse over them, or maybe display them all if you hold the alt key for a second.

Icon Display

• If you grouped different items together, you get a generic icon that is completely useless. There should be icons for categories of items (eg: turrets), or better yet, allow the user to choose a specific icon that is meaningful
• The action icon (or whatever it's called... the little on/off/run/etc icons in the corner of the hotbar icons) is similarly limited, with some used for multiple actions. Each action must have a clear, dedicated icon.

Labels

• Each hotbar icon should have a visible, customizable label that appears at the bottom of the icon. The Build Vision mod is an excellent implementation of how this could be displayed.
• All icon should have user customizable text. The current defaults are abysmal.

Additional Hotbar-able Items

• It would be very convenient to be able to add other things to the hotbar, such as items from the colour/skin palette.