Exactly. In fact, as someone else mentioned, why should a LEO-Moon ship even land on the Moon? Eliminate the landing gear and related structure, as well as the need to configure thrusters for a landing (hovers, gimbaled aux pods, etc.) and just go from LEO to LLO and let another vehicle handle ferrying stuff up and down from Luna-LLO. This is the old Heinleinian (among others) idea of a segmented transportation system between Earth and other bodies, and it's the one my addons are based on.
But the Shuttle A is a type of lunar space shuttle that can go beyond LLO and deliver things on a trans-Earth trajectory, so it has to be able to land on the Moon and then some. That's what makes it fun to fly.
For a real challenge, try the following: Launch a Shuttle A from a Lunar surface base, and do a trans-Earth injection (TEI) burn. Then, before leaving the Moon's SOI, jettison one or more of your payload modules and try to make them hit an exact spot on the Earth, say the Gulf of Mexico or the Med. Sea. Then do a burn to return to a closed Lunar orbit and return to your launch site. If the payload reenters and parachutes anywhere near your target site, good job! It'd be more than I've been able to accomplish!