Right now, when you finish training a special jutsu a notification appears saying "Special jutsu training completed" - or something along those lines, I can't remember exactly. When you click that notification you arrive on a page that says "You have finished training X jutsu to level Y".
I'd add a link to this page that would start training the next level of the jutsu.
What would change:
A new link appears on the training success page that enables you to start training the next level with a single click. It could say "Train another level!" or something like that.
How it would change:
Same thing as the previous point.
How it benefits us:
It spares us from the annoyance of going
My jutsu -> open dropdown -> train
every single time we want to train another level.
Why it matters:
It just makes life easier, especially on mobile browser.