To answer the first, yes I can, I think...maybe. Due to what RPGM plugin that's responsible for the Blessings, I'm unsure if I can move that to a passive state where it regens outside of battle. But I will see what I can do.
You earn Job Points from battle, earn enough and you unlock the next tier of class, some fiddling with the JP rewards and class unlock thresholds may need some tweaking. Also all base classes have their own unique unlockable classes, that's why they're all different. They stop unlocking after a while because I made only so many classes before I ran out of ideas/wanted to prevent power creep and make the player too overpowered whether by design or by accident.
That bug is probably caused by how RPG Maker removes assets when the "Exclude Unused Files" option is enabled during deployment since files being used by plugins sorta don't count as being "used". I will see about fixing that, but a band-aid fix would be to get a blank png file, rename it and put it into the parallaxes folder. Its dumb and stupid, but I will try to find something more permanent even if it means making a blank map with the file in question being used so RPGM doesn't auto-delete when I try to make the game smaller or I just deploy the game with all its files intact which would bloat the zip file a bit but it would fix that bug in its entirety.
With the first alpha version being close to being done, these bug fixes and adjustments you recommended will be/have been incorporated.
Thank you for your time and patience and most importantly, feedback.
EDIT: The regen blessings are now passive and work outside of battle.