I have been working with the Lipo Rider Pro extensively for the last few months. I’ve ordered have a dozen and my team and I have actually taken apart the components and upgraded half of them with extra ports and additional functionality. In my opinion there four green LEDs are a solid way to show the charge and an LCD would be a bit much. The only suggestion I could add here would be to move the LCDs to the side of the board beside the push button. This way if one puts a casing or panel on top of the circuit, you can still view the LEDs. Also you could have the red charge LED go blank when the battery has been fully charged and a single green LED stay lit.
But those are simple things. We have a major open source solar project brewing here and I hope to post more on this shortly in the forum.