Is possible add automatic text (if is forum id)
 

Hello,
I would like to know if is possible to make folowing things:

text = bla bla bla bla

1) To insert in all posts with forum ids (x,x,x,x,x) text
2) To automatic insert with every new post if is forumid (x,x,x,x,x) text.

Not sure about all the requirements you're asking, but I have this hack:

Custom Message Button

It allows you to have one phrase (as long as needed) that you can post on each ID that you designate.