motion tracking detect features options available before using operator

I'm having a go at generating a mesh from tracking markers, so used a very low threshold and distance to scatter as many as possible. Took ages.

Now I want to add a few more areas using annotations. Problem is when I launch the detect features operator the second time, I have to wait an eternity until I'm able to change the detection options to 'inside annotated area only'.

Would be great to have those options available before launching the operator, so the long wait could be avoided.

Also, when threshold is set to 0, the algorithm still takes ages whilst it detects features. At 0 threshold, it shouldn't try to detect features, it should just place them every x pixels away from each other without thinking about it (x bieng the distance property).