the expert view in "Generate key" gives the possibility to define "Subject alternative names".
To be honest, I have no idea if this is relevant for AS2 at all.
But it looks like corresponding dialog ("Manage Subject Alternative Name for the key") was meant to be used for OFTP2 instead of AS2.
Please have a look at the description: "In OFTP2 ... to set up your Odette id ..."
And I think the attributes to be added refer to OFTP2 instead of AS2, at least some of them.
AS2 build 57.