As far as I can see, this hasn't been mentioned before. Here we go, for a try:

Whenever a player completes one or more missions, the Mission Details menu shows a popup saying "You have X Missions ready to complete !". With two options, being "Complete Now" or "Complete later", the later option being the same as skipping the completion. If I chose "Complete Now", each completed mission is displayed with the same two options, to "Complete Now" or "Skip" the completion.

I am wondering, whether it would be possible to not show the first popup whenever there is only one mission possible to complete. This is nothing major, nor an issue, but it would be nice to save an additional click and a little bit of time.

Plus, there are times, when I am playing Crusaders without the most stable internet connection. Which is not too bad, since there are functionalities in the game to "pick up" the save at a time, whenever there is a stable connection again. The difficulties with checking for loot on boss levels is probably something that can't be solved, I know :-)
However, would it be possible to skip the server check on missions with a 100% probability? This would give me an opportunity to finish those missions and maybe add much needed crusaders to my line up again. Or is this check connected also with an update to the crusader's stats and therefore not optional?

Last but not least. Now, that we have the option to toggle the "new item notification", I am a little bit surprised every time I buy chests with my earned jewels. Since after that, the notification about a new chests comes up. Could you please include this notification also along with the toggable "chest notifications"?

oh, as a bonus edit:
There are missions, where I don't need the whole number of crusaders to reach the 100% probability. I.e. "Minions", "Used Cat Salesman", "Boy's Night out", and a few more. I would prefer to start them with 2 out of 3 or 1 of 2 crusaders, even though it reduces the challenges of selecting crusaders to run as many missions as possible in parallel. What are your thoughts on this?

Thanks so much!