As the admin has already shared his opinion that he might implement this feature in this forum soon, I would also like this feature but to be honest, till now even on BTT I have not come to use the ignore button AFAIR. I think Ignore buttons are not for me haha, Well, I picked one thing that most of the improvement requests are coming from teleported members, they are requesting admin to add things that they were used to on BTT.
I do find this helpful for the teleported members, but I also think it could hurt the marketing strategy of this forum as well. Because this forum is not directly linked or running through BTT, means it is not some associated branch of BTT, so we are not going to get same features as well. Instead we will get new features that were not even exist on BTT. Like the public chat (I liked it most).