You can give/restrict permissions per each accessible item in the Time to SLA plugin.
Time to SLA Top Menu items can also be restricted to users, groups or project roles. If menu is not drilled down, you can restrict all at one, otherwise all menu items can be configured separately.
About Top Menu Permissions
Be aware that when permission type ProjectRole is selected for the Top Menu Items, users should be in the global members of the selected project role. As project roles can change project by project, and top menu is not related to a project but all projects, this option is not recommended to be used. Instead of using ProjectRole option, Group permission type is recommended for Top Menu permissions.