First of all: my wishes are of medium priority. I think other people may have a better idea of what is important.
Wish 1: Complete desktop support by supporting all apis of sites as gamejolt and itch.io. (so that all features work. For example ads, achievement and leaderboards)
Wish 2: when new features for an existing monetizing plugin arrive, I wish that this will be implemented in C3.
Example I received by email:
"
Engage users with rewarded video and maximize the value of content
AdMob rewarded video ads are ad formats that give users the choice to engage with an ad in exchange for an in-app reward. With rewarded video ads, you can reward users with in-app items for watching video ads."