I was wondering why I can't find the option to auto-package web resources (webapp/..) on change.
I only found outdated discussions about this issue. The thing that comes closest to this issue might be "Update Resources" (and "Update Resources on frame deactivation"). But this is not very efficient (at least in my case), because it re-compiles (!) all (!!) my modules (~8) again. Making things worse, I'm using Scala, which takes a while. Fixing this can easily reduce the time I wait for a html/css change from ~45 seconds to ~1 second.
Basically either this option is really missing (IDE issue) or the Scala plugin should not be called (SCALA issue) on resource updates.