Are you on DRUGS Chris? If someone wanted to be adventurous live or in the studio using a new digital Mellotron, there is nothing holding them back.
I'm struggling to think of many of the revered Prog Gods who used the Mellotron 'adventurously'. It's not a particularly 'adventurous' instrument. You can use it up front, play it melodically, harmonise all over the place, and certainly you can process the sound or do whatever else you like with it, but adventurous? You can dick about with synths adventurously because you can make them say what you want them to say, but a Mellotron string section is always going to sound like a cello, a viola and three violins, all vaguely out of tune and all sounding monolithic. Ninety nine percent of the people who have put hand to Tron have used it for block chords. Where is the adventure?
It's still a welcome surprise to hear it at all. I heard it on the intro a fairly nondescript pop song a year or so ago while seated in the dentist's chair and exclaimed 'gucking gell!' as I was having my mouth seen to my an astonished dentist who thought she had accidentally probed through a raw nerve.