Awhile back, I persuaded Lars Hassing to add a feature to L3P. 
I wanted the ability to substutite POV language commands in 
the comments of a .DAT file that could be used in place of 
the DAT primitives when rendering through POV. This would
allow users to add native POV commands that could render 
better than the triangles and polygons defined in DAT files. 
Since the commands are inbedded in comment fields, and only 
recognized by L3P, they have no effect of any other tools. 
Lars was waiting untill I tested the commands to announce the 
feature. The good news, is you probably already have the 
ability to use these features. He built them into 
Version 1.2 20000616.

The commands are
0 L3P IFPOV
Conditional section begin
Begin POV statements in comment statement fields

0 L3P IFNOTPOV
Conditional section begin
Begin DAT statements

0 L3P ELSEPOV
Switch between above section modes

0 L3P ENDPOV
Terminate conditional section

After running L3P, you can see in the POV file conditionals like
if(0) or if(1)
To see the alternate version for comparison, just change the constant in
these conditionals.