You can change these settings in ..\ArmA2\userconfig\ACE\ace_clientside_config.hpp However you can also use ACE Clippi to change these settings more easily.
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Ongoing development 
ACE 1.13 RC5 [2011-12-09. Hotfix: 2012-04-27]
Stable
ACE 1.13 for OA [2011-12-23]
ACE 1.3 for A2 [2010-07-05] (Deprecated)
Dev blogs
Wheeled by Wagn v. 1.8.1