My first success in compiling Symbian^3 source codes with Raptor and RVDS =)
Close menu using Options - Exit, then unpack archive to C: drive
Now you can modify all grid layout parameters by editing C:\System\grid\custom\akn_logical_template_3.xml file.
small update: qfn_smallest constant for smallest font size (use in mul_title style attribute) Screenshot
small update: scrollbar option in orientation category. scrollbar="yes" for showing scrollbar, or scrollbar="no" for hiding.
Download link - https://sites.google.com/site/icoderus/CustomGrid.zip