Personally, yes this would be nice, but not as necessary as the PM timer...
There is nothing more iritating for me, when doing a mediation and sending the confirmation pm's to the traders, to get the message: you must wait before sending another pm bla bla bla.....
I also miss my indefinite edit time... but that's another story

I still voted yes.
Retired doesn't mean inactive.
A lot of people still request that we help them, cause they have no clue what RM means..