Bold key binding is not right in Lyx 1.6.0rc2

[Matthew Bromberg]

While I think there are some great improvements in Lyx 1.6.0rc2,  there 
are some serious issues with regards to the bold font change ctrl-B.  
For most mathematical documents,  the convention is that a bold font on 
a variable name represents a vector or a matrix.  These should not be in 
italics!  They should be in the same font as the normal text.  That is 
the standard used in most mathematical text that I'm aware of.   
Unfortunately in the new Lyx ctrl-B generates a \boldsymbol{} command 
instead of the old default \mathbf{}.  This is very wrong I'm afraid.  
Most variables in math mode, once they are bold should be in a 
non-italic font. 

In some cases, for some greek variables used as vectors and matrices,  
one might need \boldsymbol,  but for the vast majority of mathematical 
notation that is not the behavior you want.  If you write a scientific 
document that uses a lot of vectors and matrices, the change is 
disastrous.  It is critical to be able to swiftly change from bold to 
normal using hopefully a single keystroke.  Otherwise, if I have to stop 
typing and move a mouse,  I might as well go back to ordinary Latex.

Another potential issue as well is the fact that the bold command ctrl-B 
no longer toggles bold, instead it makes it more bold.  We need a way to 
quickly undo the last bold.  Backspace seems to work kind of.  Perhaps 
there could be a keystroke of some sort that undoes the last bold or 
last italic etc.  Is there a way to change the default behavior of 
ctrl-B or other keystrokes?  That might be a workaround.