set it with your prov xml; Here is the code
<!-- Set Scroll Bar Size -->
<characteristic type="HKLM\System\GWE">
<parm name="cxHScr" datatype="integer" value="16"/>
<parm name="cxVScr" datatype="integer" value="20"/>
<parm name="cyHScr" datatype="integer" value="16"/>
<parm name="cyVScr" datatype="integer" value="20"/>
</characteristic>
and some more finger friendly settings;
<!-- Set Large Task Manager and tap to close and tap close album -->
<characteristic type="HKCU\Software\HTC\TaskManager" translation="filesystem">
<parm name="SkipAK4Camera" datatype="integer" value="0"/>
<parm name="EnableLargeIcon" datatype="integer" value="1"/>
<parm name="EnableTapAndHold" datatype="integer" value="0"/>
</characteristic>
<!-- Enlarge Start Menu -->
<characteristic type="HKLM\Software\HTC\EnlargeMenu" translation="filesystem">
<parm name="Enable" datatype="integer" value="1"/>
</characteristic>