A couple of things can be changed for a better in the UI.

Firstly,

Moodle uses different terms for exactly the same.

In the assignment submission screen, a teacher can choose for a single student this option: 'prevent submission changes'.

But.. .when you select the same student (or multiple students) by using the checkbox in front of their names, you will get this on the bottom of the page:

So suddenly, the exact same functionality is now called 'LOCK' and 'UNLOCK'.

Secondly,

It's about the 'MORE' icon above. There's plenty of space to just add these options to the screen itself. The 'MORE' option doesn't benefit anything, it just hides options AND results in one extra click for users.

These are two interface improvements I found recently. Hope someone can take a look at that!