- It is possible to scale radius of MetaElem again.

- It is possible to change dx, dy and dz params in 3Dview with manipulators
    or with some shortcuts (S-X, S-Y, S-Z).
 - User can scale stiffness when green circle is selected.
 - MetaElem is selected with RMB click at green or red circle, then user can
    grab or rotate with MetaElem as usual.

 - Screenshot:
    http://e-learning.vslib.cz/~hnidek/pics/scale_stiffness.jpg

 - Captured video:
    http://e-learning.vslib.cz/~hnidek/captured-videos/scale_stiffness.avi

source/blender/src/transform.c

@@ -1021,6 +1021,9 @@ int Resize(TransInfo *t, short mval[2])
 					add_tdi_poin(tdi->sizez, tdi->oldsize+2, vec[2]);
 					
 				}
+				else if((td->flag & TD_SINGLESIZE) && !(t->con.mode & CON_APPLY)){
+ 					*td->val = td->ival * fsize[0] * td->factor;
+ 				}	
 				else {
 					td->ext->size[0] = td->ext->isize[0] * (fsize[0]) * td->factor;
 					td->ext->size[1] = td->ext->isize[1] * (fsize[1]) * td->factor;