Is there an official developer log I can lob this into? Quick Duck Duck Go search I didn't see it.
What I'd like to see is lessened sensitivity to mouse context changes (I don't know if this is the best summary, thus further description provided). For example, when working with the color curve popup and I'm modifying gradients, I have to work HARD to slide the existing pens, I constantly end up adding new black pens because of a last-millisecond switch of context from sliding to adding, which takes a 0.1 mm accidental move of the mouse. As I write I realize maybe I should try a breathing technique, like sucking in a full breath and holding before I press click.
I also have this dynamic when modifying the buffer layout in the layer settings (i.e. moving the entire box when what I want to do is resize from a corner), when doing precision work with effect start / end (I end up zooming in tons to make up for this).
I love the software, with just the surface I've scratched what it allows me to do, for free, is mind-boggling to the point of being otherworldly. This request is a "tax" I feel I'm paying heavily this year. My monitor is 4k now so the tax is worse (I run it at 150%, the extra screen real estate is too valuable to magnify further), but I've always had some issues with this as a 4-year user.
2) Another thing I run into all the time is effects not rerendering, particularly when applied to large groupings, particularly with the House Preview. I found Force Render this year and use that to compensate. I don't know what causes this. I clear the cache on occassion, doesn't do much usually.
3) A wipe effect that functions like Vixen 3, where a pulse can be swept across a variety of ways with a variety of easy fades. I've figured out some hacks but they are just that. A majority of the time I think the other way, I wish Vixen did "X" effect more like xLights.