I have tried using the following
<script type="optional">
<title>Auto-Pickup Event Items</title>
<description>Your character will automatically pickup event items when you are close enough.</description>
<table id="items">
<entity id="185,156,187,188,189,190,192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,224,234,240,242,243,244,1822,1823,1824,1825,1826,1827,1828,1829,1830,1931,1932,1933,1934,1935,1936">
<attribute id="bitmask03" bit="autoPickup">true</attribute>
<attribute id="autoPickupDistance">12</attribute>
<attribute id="stackSize">1000;</attribute>
</entity>
</table>
Yet as soon as I finish installing and run the game, all the stackSize return to their default value. Ive tried picking up a bunch of these items and they dont go past the previous default parameters. Do I need to change these values in the items.txt for the mod or just add it to the install.xml?