@Xeron
I have to admit that I made lot of assumptions about 4.1 but adding 4.1 compatibility line was too tempting. AFAIK universal notifications and automatic expunge does not add new DOS vectors. 64bit DOS support might add some new vectors but binary which I got few weeks ago did not reveal anything new so I thought it only completes existing API calls I knew about.
It is largely based on guesswork rather than cold hard facts but I have noted that betatesters get an access to the latest OS4 SDK always and they also update their SDK very often. Therefore it seemed good assumption that OS4Emu 2.0 has 4.1 API calls also.
OS4Emu itself does not add or implement any new functionality. It just only wraps OS4 calls to native MorphOS calls, translates taglists and so on. API compatible is not same as feature compatible: for example ExamineDir() is 64bit in MorphOS 2.0 but 32bit in MorphOS 1.x -- OS4Emu does not magically bring 64bit dos functionality to MorphOS 1.x users.