Onscreen, we haven't heard of limitations in beaming GPL. Moreover, we haven't heard of limitations in replicating the stuff. For all we know, it's easily replicable - but doing so would be akin to xeroxing hundred-dollar bills. It would be so much worthless paper/alien metal because the value is abstract and coded into each bill in writing / brick, strip and slip in chemical form. For small transactions, Quark would taste the GPL, as seen: if the taste is in the right ballpark, it's not a forgery or at least can be passed on to other Ferengi, and the exact code need not be read. But for larger transactions, Quark carefully scans whether the brick indeed is unique or a worthless identical twin to an existing brick.
I really wonder whether the E-D saucer could have contained substances that couldn't take transporting but would still be useful after the crash. In novels, victims of injury are sometimes considered too unstable to be transported, but that's not a well-founded canon concept; nevertheless, many of those shuttles might have been for medevac, or for delivering teams of medics complete with treatment facilities and gear. While I'd imagine beaming down a surgery tent would be faster, a dedicated surgery shuttle would not need assembly on the spot...
Timo Saloniemi