While defense in depth is never wrong, please be aware that even moderately advanced trojans will simply capture the contents of any form fields in most browsers. Neither your "skipping" technique, nor (partially) using an on-screen-keyboard will help against that.

Using a second factor for authentication provides some extra security, but a well-configured trojan might intercept your logout request, display a fake logout confirmation and store your session data for their botmaster to peruse.

If you need to regularly use untrusted machines (and have access to usb ports or a cd drive), you could bring a hardened browser with you. That should defeat most "Man-in-the-Browser" tricks. Or, even better, a live CD or USB drive. At this point, you should still assume your keyboard and screen to be compromised, but the OS should be safe enough to cautiously use.