I would like to see the ability to add, delete or change existing team and pitch information. When I first started I was entering age and coach information for each club, which changes from one year to the next. I was also not very specific with pitch names and numbers, and have some duplicates or incorrect pitch names or locations.
Being able to rename or remove teams or pitches would allow for more functionality in terms of maintaining league resources. I would imagine this would be easiest to do on the web or a PC, but could see some functionality in a mobile setting as well.