Sometimes I want to use heatmap not as a heatmap, but as a summary map. It implies, I cover many DIFFERENT routes only ONE TIME and I want to see them all on one map. In this case, it'll be 'cold' color, and it's hardly visible with 1 px thickness.
My idea is to add a special field where I can set minimal thickness of the line on the heatmap. So, if I even ran only once in some place, it could be clearly visible on the heatmap.