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LAST MINUTE CHANGES
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I decided to add "add on" capability just before 
releasing it, but didn't have the time (nor the energy)
to update the documentation. So, here's how to:

You can make your own "addon" to SmokeGen by redeclaring 
the macro TrailObject() otherwise found in SmokeGen.inc. 
Just declare the macro (make sure to use the same name 
and the same number of parameters) and put it in a file 
(say, "MyObject.inc"). Before including SmokeGen, 
include "MyObject.inc" and, voil, your object will be
leaving another type of trail!

(An example can be found in TrailObj.inc )

Syntax for the macro is:

TrailObject(param1,param2,param3,param4)

Even if you don't have use for four parameters (maybe not 
even one single one) you still have to declare the macro
taking four parameters. 

Just remember that the value submitted to parameter[1] 
will be the value originally passed as a size parameter, 
the value submitted to parameter[2] will be the 
originally passed as a turbulence value and so on. 
It's up to your creativity to find out what to use 
those values for! :)
