Units problems

Hi,
I use max from max2010 and I always use units : meters/meters ( display unit/system unit )

I work in archviz, so i use to have big size models ( 1km or more )
But I need to model also on same file furnitures details.
More or less it works...

But each time I need to animate, use bones, massFx,.... I have problems.

Now I'm fed up and I want to use more fun tools in max and decide to work in meters/centimeters.
I can't use centimeters as display because I work a lot in altimetrie.

My problem is that I made some measure scripts that display in system unit.
So if I have a distance of 1 meter, it is displayed 100.
I could divide by 100, but if I change system unit to inch, I need to redo again.

How can I display in sliders and in the good value ?

I read "Units Struct - Accessing System and Display Units" and a lot of forums...
but I don't know how to do...

Please can somebody help ? Thanks