Please implement custom package values per user same as CPanel has.
It would be nice to update just one user rather than whole package on any changes that have to be made for a specific user.
Example:
If user has custom value > 0 for storage quota then storage amount from package itself should be ignored.
That includes parked domains, subdomains, email and ftp accounts, etc.
Same thing as CPanel has. It's not that difficult to add few if statements.