I would love to see a swell setting. Yes, there's the "swell helper" preset, but that's not what I'm after. The DL4 and upcoming Strymon Timeline have swell settings that manage the volume ramp for you so you get a consistent, nice effect.
Not sure how this gets incorporated given the existing layout, but it sure would be a nice addition. Perhaps it could roll into ducked delay, and the Xnob could control whether you get traditional ducking or a swell. From 0-50, you're kind of reverse ducking where the overall signal ramps in. From 51-100 you control traditional ducking.
Like a Boss Slow Gear kind of thing? Like playing VH's Cathedral without wearing out your volume pot and your pinky? Yeah, that'd be cool. I could see that in either the TF or the MF, depending on how it was implemented.