par(mfcol=2, mfrow=3) equivalent for trellis

Dear friends of lattice,

I know how to position trellis plots with print(...,split,more=T) or
(...position).

Sometimes I wish I had something like the old "par(mfcol=2, mfrow=3)"
mechanism, where the next free viewport is automatically chosen. I tried
fiddling with grid-viewports, but could not find an easy solution.

Did I miss something?

Dieter Menne