Billing features separately
I'm on the premium trial and I'm pretty impressed at the PMC chart. I'd like to check back on it from time to time but the 15 day trial is a tad short to get much from it, since the changes are fairly long term.
I wouldn't get enough from premium since I'm already using other tools to do some of the things that TP does and at the moment it's out of my budget.
Would it be possible to have a billing system that charges for features separately? e.g. I want to look at a PMC graph once or twice a month, and I'd gladly pay a buck or two to generate it.
A semi-premium mode that lets you check/uncheck what you need and bill you accordingly (e.g. Updated PMC, peak performances but no planning or detailed maps) would also be amazing.