Using a Tasbeeh

Q: Is it permissible in Islam to do zikr on a Tasbeeh because some one said that our Holy Prophet (Sallallahu Alayhi Wasallam) never used a Tasbeeh in his life. 

Listening to Naaths etc with the words "Yaa Rasulullah" in it

Q: Considering the fact that Rasulullah (Sallallahu Alayhi Wasallam) is not omnipresent, standing up during Salaami isn't allowed. With this in mind, is using the words "Ya Rasulullah" allowed when not in front of Roza Mubaarak? In effect, what I'm asking, is there any problem in listening to Naaths etc with the words "Yaa Rasulullah" in it?