Thanks for your feature request. I will inform our team of this.
Thank you for your request. Since TA 8.x, the TA installer allows user to select to install TA Client only or both TA Client and Repository Server. Regarding the request to install Agent only, it is not taken by the Product team. TA Agent and TA Client are using pretty much the same components but just the UI which just consumes few more MB.
Thank you again for your request. Please continue voicing us your ideas that make your daily work easier, we are happy to hear from you.
This is nice to install the required parts for agent mode operation without installing the entire TestArchitect GUI.