This would be a real handy feature to have 
You can find more info on how Atlassian has setup SourceTree with these features here: JIRA integration & other external project links | SourceTree Blog
Furthermore,
Being able to update the status of an issue / ticket in-editor would be more of an undertaking, yet would be a luxuries feature/controller indeed for both naively supported plugins & 3rd-party plugins.
As asked by myself (alias BLOODTIDE12) on the 26th of June, 2014 Twitch Broadcast
Will we be seeing an issue / tracker i.e. like JIRA / BitBucket / GitHub integration into the engine source code controller for plugin support natively in the UE4 master branch?
Q&A Source: http://youtu.be/qZjfI8_MWkA?t=35m13s
p.s. I will move this to the forums if requested. I will also be happy to help with bringing together the version control plugin community for further discussion on the topic in collaboration with Epic Games:)