hey great website!
well you could make elements position fixed using custom css, but thats something quite different than sticky
you could make a whole row sticky using custom css, by right clicking the row, giving it a class name and then creating custom css for it
but then the row won't ever stop sticking to the top once you have scrolled it into view
im in the process of re-developing the gridder and then i will add more functionality to it
so this will take a very long time!
so at the moment theres no other way to do it except put things in a stack and yes it really limits your ability to layout things :|