I'm not exactly sure what do you mean, but I'll give it a shot.
If you mean that there is no separate subid adding option in the banners section, then you are correct. The extra data fields are added manually into the link. You can either do it yourself when defining the banner, by just adding &data1=variable1&data2=variable2 or have your affiliates add the parameters into the links manually when posting them
If this is not what you had in mind, feel free to contact us via chat or email or this post to specify.