Hey @PatrickMast and @AnsonHwang! The dev team is looking at adding more support for footer behavior in apps. No updates on sticky components specifically.
I don't know how you solved this @danny but I'm curious to see it as well!
Components typically have a parent element that exists in a fixed position on the page but that parent element doesn't have a unique identifier. Since absolute or sticky styling is relative to the parent element that makes it tricky to make individual components sticky. For instance, using something like the following to will make all containers on a page sticky, which might not be what you'd want 
._retool-ContainerWidget2 {
position: sticky;
top: 0vh;
}
If someone has a better workaround that'd be great!