To get the incremental flaps on a Mac you have to put this text into the air.cfml
air.cfml is found here: /Users/User/Library/Preferences/ww2ol/cfml
copy and past everything in between the bold to get flap control
<control function="Flap control">
<keydelta value="25.00" per="keypress">
<key>page down</key>
</keydelta>
<keydelta value="-25.00" per="keypress" index="1">
<key>page up</key>
</keydelta>
<keyabsolute value="0.00">
<key></key>
</keyabsolute>
<keyabsolute value="0.00" index="10">
<key></key>
</keyabsolute>
</control>