Yes, the 10% 'fee' has been removed - from 1.3. I haven't heard that FD have promised not to put it in at a later date.
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I personally would like something similar to be implimented. With perhaps a sliding scaled dependant on time the module has been owned, so that if you return it within a day, you get penalised less than if you had it for 6 months.
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I would also agree to storage fees - if they could be worked out fairly. FD would need to consider several points.
1) how/when are the storage fees paid? What happens to modules stored because the owner has gone exploring for 4 months? At what point does it become cheaper to sell a module and take the (proposed) 10% hit on the selling price? Will it be a 'Pay up front' system where the owner risks losing the module if he doesn't get back in time, or is it a 'subscription' based service where the money is automatically removed from your balance at regular intervals?
2) how are they (FD) going to deal with all the extra data this will generate? They will have to keep who paid for storage, where the item is stored, and when the storage runs out on what could be multiple items over multiple locations for each and every commander in the game.
3) Is it a flat fee or a 'tiered' system? Obviously a larger module will take up more space in the station, which means the station would be entitled to ask for more money to store it. How much more? What about module quality? Surely better modules would need to be insured (by the station) and that will increase their costs. What happens when you combine those factors? A E1 module will certainly be cheaper to store than an E6 one, and an E1 module will also be cheaper to store than an A1 module, but what difference in cost to store an E6 compared to an A1? The A1 is smaller, so the station can collect more fees in a given space, but it is more valuable so may need secure storage and possibly guards on it.
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Also I would not have a flat rate docking fee, but have it based on pad size so small pads are less expensive to land at than medium pads, which are less expensive than large ones. Fees could also be collected at the end of your stay, prior to releasing the clamps. This way you have had your chance to sell your cargo/hand in your bounties or exploration data, and mostly they should be CHEAP! You don't want to price beginners out of the game because they are bankrupt before they have got the hang of the game, and again, you don't want players to think that you are just adding to the 'grind' of the game for the sake of it.