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Currently there is no such implementation. However, this was a topic brought up at the last ROS Live meeting, and seems that the idea is to try and allow a user to have more 'coding' freedom from within a launch file. I have seen some workarounds that people have posted in the past, and what they did was created a regular bash script that called roslaunch files from within itself, as it was easier (or maybe currently the only way) to implement a delay between roslaunch starts.