Probably one of the most annoying things about leveling up, is constantly filling Recruits of each sailor. It wouldn't be so bad if it was a simple 1 click for each sailor to fill max recruits, but theres not (to my understanding) it is very hard to maintain a very decent number of recruits on smaller leveled sailors as is starts to get boring to have to keep scrolling on each one of them.
The worst is when Rolling for vets.
You may find yourself using 500 experts and possibly with bad luck would mean having to scroll to get those 500 recruits back. but if there was a simple button that would fill up recruits it may help people find it more fun to play.
Just a suggestion as it sometimes gets annoying having to constantly roll.