Has anyone found a solution because marks not had a reply so it looks like Brajesh has stopped working on this,

Has there been any updates to this yet ?

this worked halfway for me

http://latinosparis.com/simplecode/el-problema-con-buddypress-y-wordpress-seo-by-yoast-solucionado/

Hi thanks for the update,
Im having the Same problem, the group forums are still not getting custom titles,
ive added the code to functions in the child theme