When we logon to our Juniper SA4500 with a role using Network Connect (NC), the user gets a home screen with a "Start" button for NC. Their VPN connection is initiated when they press the "Start" button.
We would like to have the same kind of behavior with Junos Pulse. There are three connection options:
I am on 7.0r3 and i have the option of displaying Pulse exactly like you mentioned, on the page and user clicks start to intiate. You can also configure pulse to automatically come up after the user logs into a computer and then simply just enters their UN and PW directly into pulse without having to visit the SA website for login.
My system also behaves like Mike's. User gets a start button next to Junos Pulse. Clicking it connects the pulse client. It appears to use the same session that the web browser initiated.