Are there any documented instances of coronaviruses being directly transmitted from bats to humans?
It is possible, but unconfirmed, that the first incidents of SARS-CoV were directly infected by bats, and that palm civits were infected parallelly:


  The new study demonstrates that Chinese horseshoe bats harbor a pair of SARS like viruses that are very closely related to the strain that caused the 2003-2004 pandemic and that these strains have the capacity to directly infect human cells and civet cat cells as well as bat cells. These findings suggest that bats may have directly infected humans and that civet cats may have been incidentally infected.



More Evidence Emerges That Bats May Have Spread SARS, JAMA (2013)