Re: What necessary changes should be made to BP themes for BP 1.2.6
I would say all things should be required by Blogs-Mu to be honest. However, it’s going to be a case of you’re only going to know as do. You definitely will have template changes otherwise have the magical double button issues on friends and blogs 
Not sure what you mean about php file … it’s a case of finding the file and replacing the content with the updates should be pretty much a copy and paste job with Blogs-Mu.
Are you sure your site works correctly? I’m fairly sure you’re going to find some issues about the site and to be honest I’d always recommend updating. Ultimately it’s up to you but my recommendation is a calm methodical copy and pasting session
