[sciurius]

IMHO, sort title is exactly that: the content to be used for sorting, bypassing all other logic.
In the absence of article recognition, one would set a title to "The House" and the sort title to "House, The".
Another example is "25 Years on the Road", which should be sorted with "T" ("Twenty-Five...").
Should you implement dictionary sorting one day, then "24. Our House" will be sorted as "Our House", but I still would like to have a way to have "25 Years on the Road" sorted as above.
Bottom line: sort title should be used "as is".

I expect very few people to actually use sort titles, but I may be wrong.