[plt-scheme] Drscheme line highlighting

Hi,

I'm new to the list (and to some extent to PLT) and have a tiny
Drscheme question: is it possible to set the current line to be
highlighted somehow (perhaps a subtle shading)? In particular, I would
like the "goto line" shortcut to move the cursor to the desired line
/and/ highlight it somehow.  I am slowly blinding myself searching for
the caret ;)

Cheers,
D