pert:
So that would allow signals with different sampling intervals to be plotted, right?
Not necessarily - my main concern right now is just keeping the options open 
Let's say I want to compare, visually, sensor readings under two conditions. I'd draw a 500-point graph for condition 1, switch to condition 2 and draw the new graph on top of the previous. For this kind of thing you need separate data series, feeded separately.