No, there is no such feature. and I must say that this is a big debate on my site, some members would like that. I am against it. There may be 36 reasons why a member stays idle for a while, it can be 3 months, a year. It is common for me to see old members whom I had not seen for a long time become active again. For me a member is "dead" when his email address returns an error. this is the only case where I delete them. For all other cases, I think the member has the option to delete his account, if he does not, and he receives the notifications is that he thinks to return later.