Hi, I think there's a problem with packages libxcursor-dev and libxcursor1: the file /usr/lib/libxcursor.so should be moved into the package libxcursor1 (and not libxcursor-dev), otherwise you cannot benefit from the XRender cursors unlike you install the libxcursor-dev devel package. (It took me a entire day to understand the problem :P)
It's unlikely that end-user will install libxcursor-dev anyway... What do you think about it ? Best regards :) Damien