Currently when an user dong have access to an app they can request access. and and email is generated to the owner for this. which is good. now what its missing is some more options like :
change recipients of the access request email, the owner ( Developer) is not always the actual Owner of the application and this is manage by different people. therefore the ability to add a different user / Group / Distribution list to received that mail would be very good,
in addition to this, customize a the message when someone tries to get access like contact email@example.com would also ba a nice add on.