I'd like to see the ability to add a "Category" to a Job. I currently use the Description field as a category and then I can sort my tasks by description so that I have like minded tasks in a group.
The other thing I'd like is to have a "Note" field in each job and possibly each task that would allow you to put extra information in regarding the item in question.
For instance, when I disable a job, I'd like to put in a note as to when I disabled it and why. This way when I come back later, I have an idea as to why it was done and if there is any other information (like what to do if the job fails) we have that information tied in with the job/task.
Did I mention that I LOVE Visual Cron!!! I really like the API - I wrote a web service to talk to my VC server and extract the jobs, then I tied that into Sharepoint so that my users can come in and see at a glance the jobs that are scheduled, when they'll run next and how long they ran the last time as well as if they failed or not. I'm going to eventually tie in a history to the jobs so that they can see the past runs and statuses as well.