Set margins in app.config for logging

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Hi,

Is there an element for setting up margins for a logging file in the app.config?
Is there also a way for putting the datestamp before the ".txt" extension because now it's looks like: InfoDebug_Logging_TestSimulator.txt.2011-05-20
I want it like this:
InfoDebug_Logging_TestSimulator_2011-05-20.txt

<appender name="RollingFileAppender1" type="log4net.Appender.RollingFileAppender">
    <file value="Logging\InfoDebug_Logging_TestSimulator.txt" />
    <appendToFile value="true" />
    <!--<rollingStyle value="Size" />
    <maxSizeRollBackups value="10" />
    <maximumFileSize value="10000" />
    <staticLogFileName value="true" />-->
    <!-- Alternatively, roll on date -->
    <rollingStyle value="Date" />
    <param name="DatePattern1" value=".yyyy-MM-dd-HH.\t\x\t" />
    <maxSizeRollBackups value="20" />
    <maximumFileSize value="15MB" />
    <filter type="log4net.Filter.LevelRangeFilter">
    <acceptOnMatch value="true" />
    <levelMin value="DEBUG" />
    <levelMax value="FATAL" />
    </filter>
    <layout type="log4net.Layout.PatternLayout">
    <conversionPattern value="%date{HH:mm:ss.fff} %-5level %-32logger %-30M %message%newline" />
    </layout>
  </appender>

thanks in advance