One idea is to replace boot manager with some sort of partition-starter (like, eg NTLDR or Loadlinux), which could be loaded via a variety of boot managers.
The idea then is that one could start OS/2 from different operating environments etc. For example, one could start it from a rescue floppy disk, in the manner that one can do Windows NT (One can format a diskette in NT, and place ntldr, ntdetect.com, and a boot.ini on it, and bypass the c:\ boot menu.
Such a thing, could for example, allow one to access OS/2 in various modes (kind of like character-mode only safe mode) as well. F8, could for example activate this mode.