1. What is/does XPOI (do)?
It's our next product, there's a reference to it on the Home Page. As soon as the dust for the JFK release settles down, we'll do a presentation of it. Right now, in the Addon Manager, is labled as unavailable, which means it can be bougth yet.
2. When I check the "View Optimize" Check box and click the "Save to FSX" and Restart FSX, the Check box still remains unchecked (from v2.5.0.5); Is it still NON-Functional? What does/will it do?
I think having already explained what it does: it's a feature that checks a building/scenery object position against your viewpoint and, if the object is behind you, it will entirely discard it from memory. This might have or not a positive impact on fps, but it system dependent. If the checkbox is not checked, the optmization is turned off. The default is with checkbox off and no, the setting is not saved anywhere, it reverts back to default when FSX closes. We are not saving the setting, because we are still not fully convinced of the benefits. Hearing users feedback might help. However, the fact that the setting is not saved, doesn't mean the checkbox is non functional. If you enable the option, it will work: it will just go back to default when exiting.
This setting is valid for all sceneries handled by the Addon Manager,.
3. Does the Addon Manager settings seperate all settings for each airport selected from the above Vendors or are they global settings for all addons within the list?
These settings are basically a freeware FSX tweaker. They don't have anything to do with the airports listed above: they are global to FSX and are always in effect, regardless if you are or not at an airport handled by the Addon Manager, and regardless if you bought anything listed there. They are just FSX.CFG tweaks and, of course, by pressing "Save Settings", are saved there.