Mixed and vertical layouts

[ghost]

Are there any plans to introduce mixed vertical and horizontal layouts, i.e.:
fixed nav-fluid content-fixed banners
or
fixed header-fluid items-fixed footer

Here's my shot at it in LESS:

.hxfx-123 (
@leftWidth,
@rightWidth,
@leftGutter: 0px,
@rightGutter: 0px,
@centerHasPadding: 0px) {
padding-left: @leftWidth + @leftGutter;
padding-right: @rightWidth + @rightGutter + 2 * @centerHasPadding;
.lc {
width: @leftWidth;
margin-left: -@leftWidth - @leftGutter;
float: left;
}
.cc {
width: 100%;
float: left;
}
.rc {
width: @rightWidth;
margin-right: -@rightWidth - @rightGutter - 2 * @centerHasPadding;
float: right;
}
}

.vxfx-123 (
@firstHeight,
@thirdHeight,
@secondOverflow: hidden) {
position: relative;
.fr {
height: @firstHeight;
}
.sr {
position: absolute;
top: @firstHeight;
bottom: @thirdHeight;
left: 0;
right: 0;
overflow: @secondOverflow;
}
.tr {
height: @thirdHeight;
position: absolute;
bottom: 0;
left: 0;
right: 0;
}
}