Can we get a option to prorate the add on cost based on current active support and download time left that way it keeps it all even and makes it easier to budget if you need to reactivate an addon later.

I think they all bill on the same period regardless, but they will not prorate you for the time left in the billing period. They do that to avoid people buying the whole suite, then canceling and only renewing addon products right at the end of the period for cheap updates.

That's how it was, anyway. May have changed.

Yes it should already do this for you.

reason i suggested it is because it charged full price when i added pages back onto my addons ^^