How to use chain edges on fillet edge

hi guys .
chain edges on fillet edge is work correctlly when your edge is a group of curves tangent to each other but how we use it to select edges that they are not tangent. like selecting 4 edges of a surface of a box with one click with chain edges .
and my another porblem is when im going to fillet, and rhino shows the previw, when i want to change the radius by draging the number in preview its in integer type and i cant chang the fillet in preview with floating numbers . thanks

Is this on Win or Mac?
On Win, when you call FilletEdge and click on ChainEdges in the command line, you can then click on ChainContinuity and change from Tangency to Position.