As the title suggests, it would be nice if the cost of Temporal Crystals are reduced from 2 coins to 1. Various OGH instance items are required crafting enchantment items for Depth 2, and Instance Coins are a very reasonable way to accumulate these. Doubling the amount attainable would be nice as I don't see it as game breaking in anyway since there are other bottlenecks within the crafting process, thought Temporal Crystals definitely feel like the biggest bottle neck currently.
I would also like to petition for Temporal Spells to be added to the Instance Coin Shop, perhaps for 3 coins apiece or so. This is another large bottleneck, and while it won't disincentive me from continuing my OGH CH runs it would ease the bottleneck issue.