I am currently doing research on automatic case frame (格フレーム) acquisition and its applications. A case frame describes the syntactic structure of a predicate by providing a canonical representation of its syntactic structure (also known as 文型). Traditionally, 文型 contain only non-complex case-marker (e.g. が, を, に, で), however, for some applications in computational linguistics, we are also interested in complex case-markers (複合格助詞) such as 〜として, 〜に関して, 〜をめぐって, 〜とともに, and so on.
Do you know of any comprehensive study on 複合格助詞? Is there a list of most frequent 複合格助詞?
At the moment, the best I have is the list given in 『現代日本語文法 第３部格と構文』 but it lacks some common 複合格助詞 (e.g. をめぐって).
[EDIT] Thanks to @snailboat I also got the list proposed by Samuel Martin in Reference Grammar of Japanese (about 200 phrasal postpositions). As the author noted:
(...) it is difficult to give clear criteria for what is, and what is not, a phrasal postposition.