Allow to edit variables in a Release
In our company the main application is actually an IIS Site composed of several virtual applications and we have many environments to deploy to and more than 1500 variables with different people having access to modify them.
In some scenarios we have found that very few variables have been modified and the change goes unnoticed until it goes to production.
Updating the entire variable snapshot represents a risk in which case it would be ideal to allow editing only the variables needed and update the snapshot instead of the entire set.

-
Michael Noonan commented
Just thought I'd point you to a recent discussion on snapshots so you can add your voice to the conversation: https://octopus.com/blog/rfc-removing-snapshots Hope that helps!