There's the "morphing" or "interpolation" thing that I may be still neglecting and thinking that using things "line" objects is just as fine, but let's see. I'll also look into how max does interpolation, someone already told me that, I think I have an idea for that too.
I neglected the fact that [line] doesn't work with lists :) so I created an object that does it called [morph]. Hence, this takes care of preset transitions. I don't think it's necessary to put this feature inside the preset object as it makes it more complicated and in the end it's good this is a separate object as it's also useful outside the preset system and can be used on its own to morph into different arrays and stuff.
I'm doing something similar for interpolation, with another object to allow one to manually interpolate between values and lists of values, also incorporating that feature from Max. This should all be up in my repository this weeked.
cheers