Hi simon,

just catch some words of the first sentence of the reply to be a reply title instead of "reply:the topic title"

In my opinion, thats not a good idea because the first words are often "Hello", "Hi", "Good morning", ... followed by a username.

Your Example:

• hey all it's my topic title (by Simon)
  
• Hello Simon,...
  
• Hi Simon,...
  • Hi Milo,...

regards Micha