Line simplification

Hi

i'm developping an arcgis tool allowing :
* least cost route computation (cost path functions) (already done);
* simplification (weeding) of the result polyline using constraints (to be done!!).

The second point seems to be very hard because i have to respect constraints like :
* start alignment (distance fixed by user);
* end alignment (distance fixed by user) ;
* use of circle arcs with constant radius for curves (radius fixed by the user) ;
* alignment between curves (distance fixed by user);
And of course all modification of the polyline result must not cross the exclusion zones defined in the first stage.
Is there any library allowing this type of computation ?
Developements are made for AcGIS 10.0 with VS 2010 (c#)
Thanks in advance
Regards