Hello Kellie_B
Thanks for your question, and your enhancement suggestion.
The Activity Statements homepage is for those Activity Statements that have already been created in the software. My understanding is that an Activity Statement would only be created for those that need to be Lodge by Agent, which may be why the option for Lodge by Client / Agent was not added on that homepage.
Is there anything in particular you were wanting to achieve with that field? If I had a bit more understanding of what you were trying to achieve, I could possibly suggest a way to achieve that. You can contact me directly via the message option on the Community Forum.