Actually, this should work as you expect. I've seen some people with classes with more than 100 fields. My guess is that there is a problem in your template or that there is a bug in your publish version (which version are you using).
That said, I would strongly reccomend you to review the way you structure your data. More than 100 fields in a class is not a good idea in general not only because editing will be hard but because of performance issues. Maybe you can restructure your data into either specialized datatypes or by using related objects.
ok.. i actually found the problem and i guess its a bug... i was creating/modifying the user class in firefox and for some reason it just started going crazy after field number 60. it wouldn't update and correctly and that sort of things... later i decided to try this on IE and it updated sucessfully... so i'm guessing its some firefox bug... probably some javascript validation that's not going thru correctly... as i've said i'm new to eZ but i've being programming for years.. and i've had many problems like this with firefox when it comes to client scripting...