It'd be great to be able to provide a discount to clients who sign longer term engagements and the package adjust the billable periods accordingly.

Example a Maintenance Package is set for Month to Month and another package for 3 Month Commitment with a drop down, toggle etc that allows for a 10% discount for 6 months, 20% Discount for 12 months and adjusts the billable periods...

Itd be nice to also just be able to add discount codes for bundled services etc.