We try to only project to statistics we feel we can reasonably and mathematically project. Our Full Impact Cheat Sheets also use *projection data* and not box scare data that league scoring systems use, available only after games are finished, and this is a huge difference.
So some features of your league's scoring system may be left out as a result of this and it's by design.
(As one example, a subscriber once wrote in and asked us to project the exact length of each of Drew Brees' touchdowns. While this is easy for a scoring system to track after games are over using box score data, it's not something reasonable projections can include.)
Special teams TDs and "2-pt conversions" both fall into this category.