Open up unlockables.xtbl (using this mod's version for the example) using say, NotePad++, and right at the top, the following should be immediately visible:
Code:
<Name>Jump_glide_terminal_2</Name>
<Type>
<tweak_table>0.0<value0>
<value_name>Jump_glide_terminal_velocity</value_name>
<scaler>0.2</scaler>
</value0>
<value_name></value_name>
<scaler>0.0</scaler>
<value1>
<value_name>Player_glide_acceleration</value_name>
<scaler>5.0</scaler>
</value1>
</tweak_table>
</Type>
Edit that section, and
only that section, so that it looks like this afterwards:
Code:
<Name>Jump_glide_terminal_2</Name>
<Type>
<tweak_table>0.0<value0>
<value_name>Jump_glide_terminal_velocity</value_name>
<scaler>0.2</scaler>
</value0>
<value_name></value_name>
<scaler>0.0</scaler>
</tweak_table>
</Type>
Save unlockables.xtbl (keep a backup/copy of the original around, as always), and in-game, the DFA - Nuke upgrade should be restored.
Removing the 'Player_glide_acceleration' entry, made no appreciable difference for me (I wasn't gliding 5x faster with that entry present, compared to without it), so the mod should still be more or less functioning as intended by JokeJujitsu.