I found a great workaround. Win7 (I don't know about other versions) has a feature to "duplicate" your monitor setup (Window-P key, then choose duplicate). When using the AMD Catalyst drivers prior to version 13.1 this caused the two monitors to act as one single large monitor. Then by maximizing the LogMeIn screen I could view both remote monitors at full zoom! Sweet.
Then Catalyst 13.1 came along and all that came to a screeching halt. When going into duplicate mode, it actually did what it says it's going to do and instead of creating one large monitor it created a duplicate of my primary monitor. Fail for me.
Disclaimer
Don't go beyond this point if you're going to blame me for your monitor mishaps. I only write the instructions. Besides, do you really want to trust someone named Dummy Coder? Oh, you do? Well continue on then.Disable Display
I searched for awhile and finally found that if I go into the Catalyst Control Center, then go to Common Display Tasks and finally click Disable Display.Select the display to disable and select Apply. The monitor you selected will lose its signal. Don't worry. We're going to get it back.
Create a Monitor Group
Next in the Catalyst Control Center choose Desktop Management then Creating and Arranging DesktopsYou should only see one monitor available. Click on the dropdown arrow in the right upper corner of the monitor and select Create Group.
In the window that comes up select 2 Displays (2 x 1) and click Accept
Now when you do the Windows-P combination, "Extend" will create two distinct separate monitors and "Duplicate" will create a single large monitor.
Dummy Coder