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From the RPG side, you could look at "micro-games" like Microlite20 (free on DriveThruRPG), Searchers of the Unknown and Into the Odd (there's a free edition of the rules). Those all have ultra-stripped-down rules that enable them to play very quickly.
Battle Companies really helps the Middle Earth SBG rules get into the realm of RPG lite with nice mechanics on progression, equipment and character fatality risk.
Fistful of Lead Core.. The author is coming out with a proper dungeon supplement in the future, but with the core rules and Wasteland Warriors, you have all you need for dungeon bashing.