OK, I'm not sure I can describe this good. But sometimes LR is slow when you start a few tasks, like exporting images to jpgs, web galleries, etc, that you wish that those could be done at a time when you're not by your computer (say at a coffee break, lunch or even leaving the office for the day).
It would be cool with a feature where you could queue several tasks, that can be done when the computer is having "down time" or when you tell it to "start processing task queue" or similar.
Or a possibility for third party vendors to script something like this (or even yourself if you're fairly good as scripting).