I get a little bit put off by missions, but not because of the time and chance to fail. They give stackable mission satchels, which can be a pain in the butt to open one after the other. I propose an option to use a whole stack or maybe a select amount of items at the same time. Fairy mushrooms are another good examples of items used many at once.

This has been addressed before. Some fest items now have one-use-all-stack now for that reason.

However, some items it wouldn't make much sense... like fairy mushrooms. I don't need to use 1000+ mushrooms on one pet by mistake ^.^;; It would also cause problems for mobile users who can't split stacks.

It only makes sense for certain items, basically.

Also, I think Krin addressed the mission satchels thing before and there was something about 'cos you can get so many types of items, it can't run all at once, or... something? I don't remember for sure. But that may not be possible, at least not as the site is now.

There was also talk of missions changing a bit after site is revamped, but again, I don't remember all the details.

Edit: If your pets are failing missions, may I recommend looking for cheap lv60+ pets? You can dump all of their proficiency points into one stat, give them a little equipment, and they'll be good to go for most missions on that stat. The last time one of mine failed, it was 'cos I didn't notice that I'd sent a pet out for the wrong stat. That's the only time I've failed in a quite a while.