Extra permission to limit bulk replace

Problem/Motivation

We want the site administrator to be able to select which roll can bulk replace.

We allow our users to add content(tags) in bulk append strategy.
But we don't allow our users to remove or replace tags in bulk.
This due to experience with user error and implications a generic user would not know about.

They do have the permission to edit it on a per node basis.
Content monitors are allowed to bulk replace. (generally fixing typos)
That's why we added the extra permission.

Proposed resolution

extra permission; allow_option_replace_current_value
remove option $options['replace'] if permission is not given.

Remaining tasks

review

cleaner solution

My first solution was more along the lines of sub actions so that on a per view basis te available change strategies can be selected by the admin.
eg. user can replace for some views but not all.
Its rather crude now and site wide instead of on a per view basis.