I don't know if this has ever been brought up directly (i only checked the recent suggestion threads), but i'd like to suggest that the spacetime shop include the Super Kage, Super Sage and Scroll of Naraka in the list of items that can be exchanged.

At first i thought the scrolls above Sage scroll was excluded just because they're rarer, but now even the sage scroll of naraka is in the shop, so it clearly isnt a rarity thing. I find it weird (and kinda really sad) that all the other ninja exam scrolls are in the shop, but the three listed above just aren't added. They're just potential resources wasting away in my inventory ;-;

In that vein, i'd also like to suggest that medium refine runes be available for trade-in, like basic refine runes are. I'm not sure if it's a wholly viable suggestion, but for the players that are done with medium refines, i think it would be a simple solution to get rid of all the extras, like we can do with basic refines now.