Hi Fredo6, thanks for your hard work... did you work through the weekend on plugins? 
I think Question A has been answered in detail by jeff, so I'll try to answer Question B on.
B. KEYBOARD AND MOUSE
B1 Does the RETURN / Enter keys works? (you can use them instead of mouse clicking)
A Yes
B2 Does some or all of the Function keys work? FreeScale uses F2, F3, F4, F5
A Yes, but they are assigned special functions on Mac so I assume most people will change the shortcuts.
EDIT: Sorry my answer was self-contraditing. Since they are already assigned special functions, they won't work properly most of the time on Macs.
B3 Does Tab works? It is used for calling dialog boxes for parameters
A Yes.
B4 Any other issue with the keyboard or mouse?
A Not that I know of.
C. MENUS AND TOOLBARS
C1 Any particular issues?
A They seem to be ok.
D. WEB DIALOGS
This is probably the area where there are most of the problems.
In FreeScale, I use Web dialogs only for Default Parameters and Translation, in Tools > Fredo6 Collection > FreeScale
D1 does the Web Dialog window get the focus when opening?
A Yes
D2 does it show correctly? and if it does not, is there a way to restore a normal appearance by resizing it, moving it, changing the focus and coming back, etc....
A They are often too narrow to display all their contents, and there is really no way to change sizes of them right now. Exception is translation dialog box and Default setting dialog box, they are adjustable.
D3 can you type characters in input fields, and are they taken into account?
A Yes
D4 can you click on buttons, check boxes, combo boxes, etc....
A Yes
D5 Do you see double-byte characters. Go to the Translation box, and check the combox box on languages at the top?
A Yes, I use my own Japanese packs and they display with no problem.
D6 Any other issues on Web Dialog
A No.