XP exploits are common in many RPGs, it takes some time to remove all those spots. Ultimately it's not a real problem, up to the players to cheat/exploit and ruin their run if they really want to; there are often mods to do it anyway.
UI's not perfect, but it shows and does more than most do. For ex, ATOM shows nothing, Vagrus explains nothing, none of the Infinity games showed that much. Only few bigger games like Pathfinder and D:OS have a better (much better) UI.
AP cost is shown for each ability. Either hover it and it'll show on the AP bar, or it's written below the icon. Maybe I misunderstood what you meant.
Reloading individually: it's turn-based, so it's normal. You have to reload manually because you can choose between that or select another weapon, at different costs; it's also used to unjam. Frankly I don't see how else they would have done it. All turn-based games I know have an AP penalty for reloading, too.
Shift + click to split, no need to double-click. Ctrl + click to move everything directly (in loot / barter).
When you get Ursula, it becomes so much easier to craft.