Edit option with comment on blog and document

Hello All,

As you must aware of functionality that we can comment on any thread N no. of time and till the time nobody replied back to our comment we can edit it also, but as soon someone replied to our thread we can't edit it. This is good functionality but why don't we have same kind of functionality in blogs or document. In blogs and document people can edit and change their comment after someone replied to them also.

Can we have same kind of functionality like thread in blogs and documents also. ?

Regards,

Chandra