I would if it actually did something. Here are the steps I did:
1. Create Login Page and assign it a template (template is a base template for system stuff).
2. Add the Login control from the Site Finity controls.
3. Publish page.
4. Directly navigate to http://localhost/MyProject/Login.aspx
5. Type in the admin credentials. Click Login.
Nothing happens. No properties changed, nothing. I created my own version of the ASP.NET login control, added it to the controls and tried steps above. Nothing. I created a DEFAULT2.ASPX page in root and ran that as the startup of the site, added my login control, works fine. Just does not work with Site Finity.