Similar to how the "Changelist" field is a clickable hyperlink in the history panel, it would be cool if you could also make changelist numbers in the description clickable links. This would effectively just be a user friendly shortcut for Ctrl+G. Many task/bug tracking software does something similar (related: would be really cool if it could also link JIRA pages somehow).
You could require the user to use some kind of notation for this so that not ever number is auto-detected as a changelist. Something as simple as square brackets would likely work well enough (example: ). Like Swarm in that regard.
This would be very nice feature when working with descriptions that describe other changelists, especially merge/integrates.