Only idea i can steal from someone else is how its done in Inssider. Now you have 2 screens; Channels and Timeline, you could add another called Sort or Filter.
This screen could represent radioboxes for ssids in a column/spreadsheet-like page so you could sort on eg. signalstrength, then remove the ones hat your not interested in.

...and maybe a way to maximize the graphs to the display or zoom in some way(s)

IF .. Filter is a way; pleas make sort by: ssid / signal strength / channel


http://www.metageek.net/products/inssider