Custom 'Member Fee' text or at least 'Discount' text.

Have been trying to use a negative fee amount to apply a discount rather than a fee, which seems to work fine if you use it on the invoice Order Summary area, as this area lets you apply a whole discount across all users with a custom description for it.
But for the pre-set per user fees set in User Maintenance, if I enter a negative fee in there, say -0.1, then this will indeed give a discount but it labels it a fee, so it would be great if it could at least say 'Discount', or even better a custom text description for this 'negative fee'.
Also since some users would get different discounts, these would be set up in User Maintenance ahead of time, and simply generating the invoices would apply the right discount for each person with the correct labelling
A non-essential, nice-to-have feature, but maybe (?) and easy one to implement?
But for the pre-set per user fees set in User Maintenance, if I enter a negative fee in there, say -0.1, then this will indeed give a discount but it labels it a fee, so it would be great if it could at least say 'Discount', or even better a custom text description for this 'negative fee'.
Also since some users would get different discounts, these would be set up in User Maintenance ahead of time, and simply generating the invoices would apply the right discount for each person with the correct labelling

A non-essential, nice-to-have feature, but maybe (?) and easy one to implement?