1.which time will fix blend node not crop the img like the composite node? 

2.give the composite node layers add  "blend mode"??  

i see you fix the blend node  bug..Great! 

and  which time give the composite  “surface” to  add the blend mode??

Trail and echo node  bug, we  need the smooth line,,but the  trail and echo node  line is rough...

I made a comparison gif that you can see it ...