Buffering lines for segmentation

Hi there,

Great tool!

I'm using it to make some segmentation masks for land cover analysis. I notice that a significant drawback in segmentation mode is that almost all highway=* attributes are lines, not polygons. This means that they are left blank in the segmentation labels. Is there any way around this? Otherwise the labels have large gaps where all the roads are. Given that at higher zoom levels, roads are actually extended objects several pixels wide, it would be good to be able to label these. Example below:


Thanks!