I'm moving from Stylus Studio to oXygen and one thing I haven't seen in oXygen that is in Stylus is prompting with XSLT functions in tag sense. That is, if I create a select=" attribute and then type "s" and do ctrl+space, I'd want a list of all the functions that start with "s".
Of course, this would be harder with XSLT 2.0 than 1.0 but it should be tractible.
Are you missing a feature? Request it's implementation here.