I'm sure Lax can look into making it a feature where it sets a particular power plan when it has a game running and reverts to another selected plan when no known game is running. Ask him and see.

As a workaround, you can manually flip back and forth between power plans with different settings from desktop shortcuts if you're running Vista/Win7. Let's say you had a "High Performance" power plan with CPU set to 5-100% and a "Gaming Performance" plan set to 100-100%.

Open up a command prompt as Admin and use the POWERCFG command-line tool.
Code:
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\Windows\system32>powercfg -list

Existing Power Schemes (* Active)
-----------------------------------
Power Scheme GUID: 381b4222-f694-41f0-9685-ff5bb260df2e  (Balanced)
Power Scheme GUID: 87eaf9ee-a79d-4ccf-86f0-23a79c11ef79  (Gaming performance) *
Power Scheme GUID: 8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c  (High performance)
Power Scheme GUID: a1841308-3541-4fab-bc81-f71556f20b4a  (Power saver)

C:\Windows\system32>powercfg -s 8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c

C:\Windows\system32>powercfg -list

Existing Power Schemes (* Active)
-----------------------------------
Power Scheme GUID: 381b4222-f694-41f0-9685-ff5bb260df2e  (Balanced)
Power Scheme GUID: 87eaf9ee-a79d-4ccf-86f0-23a79c11ef79  (Gaming performance)
Power Scheme GUID: 8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c  (High performance) *
Power Scheme GUID: a1841308-3541-4fab-bc81-f71556f20b4a  (Power saver)

C:\Windows\system32>powercfg -s 87eaf9ee-a79d-4ccf-86f0-23a79c11ef79

C:\Windows\system32>powercfg -list

Existing Power Schemes (* Active)
-----------------------------------
Power Scheme GUID: 381b4222-f694-41f0-9685-ff5bb260df2e  (Balanced)
Power Scheme GUID: 87eaf9ee-a79d-4ccf-86f0-23a79c11ef79  (Gaming performance) *
Power Scheme GUID: 8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c  (High performance)
Power Scheme GUID: a1841308-3541-4fab-bc81-f71556f20b4a  (Power saver)

C:\Windows\system32>
Now just make a couple of batch files named gaming.cmd and normal.cmd on your desktop. Use the GUIDs you learned from typing the above on your computer after the "-s" parameter and then when you want to switch, just right-click the batch file, select "Run as Administrator," confirm the popup and voila. Instant (almost) plan switching.