[plt-scheme] paired braces in interaction mode?

Hello,

I'm probably missing something obvious. How can PLT IDE be customized to 
highlight paired braces in interaction mode for all S-expressions? AFAICT, 
paired braces are highlighted for the expression being currently edited 
only, but not for previously evaluated expressions and evaluation results. 
This feature was available in older versions of PLT (precisely, versions up 
to 205 inclusively, IIANM), but now it seems to be turned off, at least by 
default.

Dmitry

P.S. Also, it was a convenient feature of the interaction mode when a 
previously evaluated S-expression could be copied into editing position by 
putting a cursor on this expression and pressing enter.