How can we improve WHMCS?

My basic idea is to have the capability to setup stepped promotions whereby a product that is initially free for 30 days can then become £x.xx per month for x months then £xx.xx per month thereafter indefinitely.

Often very large companies in the technology industry will provide early contract discounts in this way to encourage sales. It is a useful way to get clients onboard but is also a useful alternative to the business receiving absolutely nothing in the early stages of the contract for an extended period.

I think so long as the frontend of WHMCS spells out these stepped payments terms to the customer at checkout there would be no issue and would benefit both customer and business alike.