Hello Fabien, these options are currently not used much by most users, so to avoid an interface that looks too crowded, we have to keep them in the menu.
However, we will soon work on a re-design of the entire viewer, so we will take your idea into c...
Thanks for filing this set of suggestions!Checkboxes should already be fillable.The tab key should already be working, can you share a PDF where it isn't?