Changing the real time data feed symbol using command line script when we have merged chart (historical and real time)

Hi,
Let's say we have multiple charts all with merged data feeds, one for history (say ascii) and one for real time (say TT). Currently it is not possible to be able to change the real time symbol using the command line script to specify this. This is very useful when we have lots of charts to change the symbols around rollover.
One can create a function that returns true/false and activate this at roll over. The signal would contain this function. The function would be set to true at rollover and the command line script would be like thus:
if getsymbol ="6A" then begin //the getsymbol returns the ascii chart symbol name
CommandLine ("csy dnum=1, name 6AH4, df= trading technologies") //this changes the symbol from 6AZ3 to 6AH4 but of course as it is now it changes the ascii map and not just the real time.
It would be very useful to have the commald line for changing symbol on a chart be able to specify that it refers to real time data feed.