Ok just succeeded adding MorphOS to ABS
Both 2 entries (ClassicWB3.9 and MorphOS) work awesomely well \o/
Only side-effect is that in my first attempt that I put the label "MorphOS 1.4.5" I got an "Can't execute S:Boot.abs" error. Once I renamed the entry to plain "MorphOS" the error dissapeared
Gotta be an issue with 2 or more dots or something else with the length of the description that you need to check it out for future versions.
Good work man though and really simple implementation