Ability to Lock Header

I agree. It would be nice to lock the top row and the left column. Roles should provide permission to allow editing these locked cells.

You got my vote.

The current field setting checkbox Lock table header so default values cannot be changed could be extended with:

• Lock first column so default values cannot be changed.

Furthermore it could be tight to a permission. The option can then be:

• Lock header row so default values cannot be changed except for users with the permission "modify locked header row".
• Lock first column so default values cannot be changed except for users with the permission "modify locked first column".

It is also related to #2848794: Allow to have the first column as header instead of first row because if we indicate the header is the first row or the first column, this option can be merged into one option again.