[REQUEST] Call waiting Star Code

Would it be hard to add a star code for enabling / disabling Call Forwarding? I just run into this problem yesterday after I added my housemate with his own number / account as second line to my adapter. Unlike me, he didn't want to use call waiting at all and finds this feature rather distracting.

Fortunately, VOIPO support had a link for me, so, that I could disable call forwarding on his line but I think it would be easier if it just could be enabled or disabled with a star code.