Add ability to schedule a task within a Build Plan

I'm on Atlassian Bamboo version 4.4.5 build 3507 - 27 Mar 13

I'd like the posibility to break up a build plan as follows:

• run mvn clean install on each commit

• run mvn clean install sonar:sonar nightly at 1am

Currently this cannot be down without script hacks or breaking it up into separate Build Plans which aren't good options