I'm missing a possibility to offer a product with for example 40% discount at the first purchase which will be charged with the full price (100%) after a regular renewal.

example:
first purchase of a webhost package has:
- monthly | 0% discount
- half-year | 30% discount
- one-year | 40% discount

renewal the webhost package has:
- monthly | 0% discount
- half-year | 0% discount
- one-year | 0% discount

with the current possibilities, this isn't possible because the price doesn't change after renewal to 0% discount.