How to Disable Exp loss from low lvls + how to add duel into free channel?

Hello, as subject says, they are my questions. how do I do it? =o

Matchserver / Formula.xml and put this at NeedExpLM

I got this, And i don't lvl down untill my level has been changed in database or exp rate reset.

The other thing about add duel I don't know.

<FORMULA_TABLE id="NeedExpLM">
<LM lower="1" upper="20">5</LM>
<LM lower="21" upper="30">6</LM>
<LM lower="31" upper="40">7</LM>
<LM lower="41" upper="45">8</LM>
<LM lower="46" upper="50">9</LM>
<LM lower="51" upper="55">10</LM>
<LM lower="56" upper="60">11</LM>
<LM lower="61" upper="65">12</LM>
<LM lower="66" upper="70">13</LM>
<LM lower="71" upper="75">14</LM>
<LM lower="76" upper="80">15</LM>
<LM lower="81" upper="85">16</LM>
<LM lower="86" upper="90">17</LM>
<LM lower="91" upper="95">18</LM>
<LM lower="96" upper="99">19</LM>
</FORMULA_TABLE>

Look, gametypecfg.xml, channelrule.xml, channel.xml :)