This was not trivial so I thought I would document it here.
I imagine that imagine that running ZFS and Bittorrent together is a popular scenario.
Make sure that xz is and wget are installed
pkg install xz xz wget
Download and untar the binary
tar -xjvf transmission-2.77.tar.xzcd transmissionxz
sudo make install
I have included the SMF config file I use as well as the service method shell script.
Both (I believe) are pulled from the Transmission SFE built package.
Here are the relevant commands, though a package should really be employed for this.
I may work on that later...
cp lib-svc-method-transmission /lib/svc/method/transmission
chown root:bin /lib/svc/method/transmission
chmod 755 /lib/svc/method/transmission
svccfg import transmission-daemon.xml