All object types found in MIP1 have names now, with these exceptions:
4B - Found in MIP01C01, on the floor, and in MIP01C03, on the Slig's floor.
2F - Found twice in MIP01C09, on the floor, and once in MIP01C28, again on the floor.
41 - Found in MIP01C35, on the letter "U" in the "exit no return" sign.
60 - Found in MIP01C34, in the background below the ledge, and in MIP01C18 above the platform rope. - Responsible for music changes Not music after all... 
- Resets a Slig's state and position when touched by Abe.
That's all. I know (Or at least think I know) the meaning of any other object in MIP1.
If anyone has ANY clue about what these objects mean, just say something!