Another useful feature would be a collaboration button.

It could send a request to collaborate with another user.
Another thing to consider is adding a disable likes and stars button! As well as enabling and disabling remixes.


Thanks!

Rating projects is rejected,even if you can turn it on or off.

Dislike button or a project rating system
Generally, a user's first project is something rather simple, such as a test project, a remix, or a project made using a tutorial. Because this project is simple, other users may give the project low ratings since it is not advanced. With low enough ratings, the creator might be discouraged enough to stop using Scratch. Moreover, constructive feedback is encouraged on Scratch. A dislike button may show the creator how many people disliked their project, but it tells nothing about what the creator could do better. If you do not like a project, you could choose not to love it, or you could leave a respectful and constructive comment telling the user how to improve, in addition to saying what you like about the project.

All of the above have previously been rejected:

2.1 Adding users to work on projects
Having multiple Scratchers work on the same project would be difficult to moderate not only due to technological limitations, but also because it could lead to private messaging; for more information, see #7.1 on this list. This suggestion includes live editing (similar to Google Docs) and other forms of private collaboration. If you would like to work on a project with another Scratcher, you can remix each others' projects.

At the moment, a turn-based collaboration system for shared projects is NOT rejected; you can discuss it on this topic.

4.2 Dislike button or a project rating system
Generally, a user's first project is something rather simple, such as a test project, a remix, or a project made using a tutorial. Because this project is simple, other users may give the project low ratings since it is not advanced. With low enough ratings, the creator might be discouraged enough to stop using Scratch. Moreover, constructive feedback is encouraged on Scratch. A dislike button may show the creator how many people disliked their project, but it tells nothing about what the creator could do better. If you do not like a project, you could choose not to love it, or you could leave a respectful and constructive comment telling the user how to improve, in addition to saying what you like about the project.

With that, a dislike button is rejected for anything, including projects and comments. However, a like button for comments is NOT rejected. You can discuss it on this topic. Additionally, a dislike button that does not show the number of dislikes and does not affect the project is NOT rejected; you can discuss it on this topic.

3.2 Disable remixing or censor minor remixes
One of the most important ideas of Scratch is the share aspect. Scratch is a website not only for displaying your work, but also for sharing it with others, and by posting your project on the Scratch website you agree to allow others to remix your work. You are not allowed to write “Do not remix this project” in the Notes and Credits of your project; you may get alerted for this, because it discourages remixing.

A remix of a project is allowed on Scratch, even if the remix only contains minor changes (this includes recolors). However, when you remix a project, you should put in the Notes and Credits what you changed. If you see a project that contains no noticeable changes, please use the Report button on it so the Scratch Team can take a look at it. This suggestion extends to “extremely minor remixes,” such as a remix of a game that gives you 2 points per second instead of 1. As long as the user explains what they changed about the project and gives proper credit, this is okay.

Please make sure you read the stickies before making posts.

It also may be good to note that these kinds of lists of suggestions are not allowed. If you click the orange link in my signature, it should all become clear.