What kind of additional chart types are you looking for? I'm building a power pivot like desktop tool and find people often would like more variety of chart typ

What kind of additional chart types are you looking for? I'm building a power pivot like desktop tool and find people often would like more variety of chart types besides bar, line, scatters and heatmaps, but I can't determine if it's because of aesthetics or there is analyses they can't perform with standard charts.