Can you remove the Leslie, and still have the scanner vibrato still on? Plus, does it do the Hammond Percussion single trigger/polyphonic system that defines the Hammond sound?

I am as big a fan of that sound as you are. Trouble, of course, is it is just the ONE sound (or two, if you count the other one ). Want to shade off the high end drawbars (or add a bit of 1'), or add a bit of more weight to it for a chorus, you are kind of stuck. I'm pretty sure that, back in the days when you did play something with drawbars, you wouldn't play a whole song with them on the same registration. Even just raising the Perc level from soft to hard would help a line pop out. With the B3 sound, God is in the details...
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An arranger is just a tool. What matters is what you build with it..!