Thanks, glad you like it.
- PCs really don't (at least, not yet) - at this stage its more for the GM to use to record the relevant details. Before I developed this most GMs (when they recorded this info at all) used Story Records. The Locations Extension is simply a more structured and "auto-linking" way to record the information. If the GM shares a Place Record with one or more Players then the Players will be able to see the info, but not manipulate it.
- There is no "shop" function in version 3 (the current version) or earlier, so the question is null. Any Item Record dragged to or from a Building Inventory simply copies the Item Record to the new Record, similar to dragging an Item Record to the Character Sheet. HOWEVER (Warning: Teaser Alert), in the Soon(TM) To Be Released version 4 I've written a full shop/shopping function so PCs can Buy and Sell Items (& Services - a special type of Item) form Buildings designated as "Shops" to their hearts content: the price is determined on a "Shop"-by-"Shop" basis using the original Item's Cost and percentages in a (relatively) simple calculation - all fully controllable by the GM, including "Shop" Purchase Limits, "Out of Stock" settings, Limited and Unlimited Stock, and "Shops" that Buy but not Sell and vice-versa. For Buildings not designated as "Shops" Items can be Dragged and Dropped and the currency calculations won't be applied.
- Yes, PCs won't see anything unless the GM shared the record.
- One of the reasons v4 is taking so long to get out is that I've completely re-written the NPC and the Item/Inventory linking sub-systems because: (1) I've never been entirely happy with it and (2) it would throw up issues such as this. So to answer your question: it's neither a configuration issue nor as intended - its probably a bug. Which Library Module and which Ruleset is doing this: I'd like to confirm is not an issue in the new version.
If you like this Extension then check out my other Extensions (all on the Extensions page of the FG Wiki) and the Soon(TM) To Be Released Organisations Extension.
Cheers

