I have also reached this point. I have need to show 4500 data points on a scatter plot to show a trend. Using 1.0.2 I get the "Reduce" message, however this is the visual I'm hoping to show in QlikSense:
I've tried to create a D3 scatter chart and up the limit to 5000 but I get a red stripped container with simply the message: 'Error Unknown Error' and I can't find anything in the debugging console.
I can download the data correctly, however. Is there some hidden limit?