In fact in the Dim Pro library there are some patches where you can use Dim pro's knobs as drawbars making it a lot more versatile, so they are worth checking out. I can remember exactly where these patches are as I tend to use my old NI B4II or NI's Vintage organs mostly.
It may be worth picking up the donationware Mr Donald rotary speaker simulator, this will liven up static samples. Its in the
GSI legacy collection which also includes the Organized Trio VST hammond emulation Sidroe mentioned.