Hi Juan, I have set this up for the next beta.

By default it is turned off, but you can turn it on by using this new checkbox under Options / View:



When you turn it on, you will get this labeled axis thing in the lower-left corner of a viewport:



It is also possible to change the colors for the x/y/z lines, but for this you have to edit the moi.ini file. For example to set x,y,z to be red, green, and blue, you can set this:

[View]
AxisIconXColor=255,0,0
AxisIconYColor=0,255,0
AxisIconZColor=0,0,255

I hope this is what you were asking for!

- Michael