I know this option would not be available for higher level skills such as Sakura Abyss and Meteor Strike, so this would be aimed at the more lower to mid tier skills.
#An option to auto battle/level grind certain skills
ivory shale
And the three ways to deactivate it would be to stop what the auto is doing, the skill reaches rank 1, or the weapon/object that is tied to the skill your leveling loses all durability
gilded spindle
I don't really think this is really needed as much for combat skills especially with the the update that got rid of cp requirements and made training easier
minor nexus
If you are concerned about leveling ONE skill
Due to its cooldown
How about leveling up different ones at the same time
Many skills arent easy leveling still due to some requirements like killing X mobs per use like lightning rod
However Sakura Abyss has ways of reducing its training time still with 8x exp multiplier atleast
If you are trying to rank it without boosters, you can see why it takes so long but its progression, if we give even easier access to ranking them
Why not might as well give every skill r1 because you couldnt be bothered to level it up in a slightly longer period of time
Blue Prisms from Growth Guide
Ninja 2x Pots from AH
Talent is ez 8x for training to get sakura abyss finished in under an hour
crisp matrix
If you're super lazy there are training pots, training seals, a lot of x2 training count training pots, sources of x2 exp, as well as brionac training. We get several of these rather consistently through events and some are available without events (rb talents, dungeon guide, adventurer seal shop, growth guide, etc).
The game has become a lot easier to train skills compared to the early days. I do think reducing skill grind will help some players with less time on their hands to progress through the early game skill grind phase a bit quicker. However, if the goal is to help players get to end game quicker so they're more willing to stick around then there are many other systems that would have to be shortened as this is an MMO that requires years of dedicated time to progress to end game. Right now skill training is already relatively short progression requirement in the grand scheme of reaching end game for those that take advantage of events and available multipliers and available strategies in the game.
fossil zinc
Skill grinding has been shortened enough, the problem is both skill bloat / skills that are effectively useless and the amount of other systems and the time it takes to finish those.
Skills are the only 'quick' streamlined way to get stronger now. If anything, stardust and erg should be the systems cut down, not skills.