Given the relatively closed nature of FAST ESP, there are a number of areas that are not well documented. This makes our jobs as search engineers difficult when we are required to solve a problem in one of these undocumented, or lightly documented areas.
In March 2011 I wrote a white paper, FAST Search Engineer's Guide: An Alternate Approach to SBC Absolute Position Boosting, that describes a method for applying SBC-style Top 10 or Absolute Position boosts without the use of SBC.