I know this has been asked before, but i cant find an answer that suits me.

1. I want to stop line weight scaling and i cant make it hairline because i need it to have a certain thickness. I want to stretch the symbol, NOT have the line weigth scale.

2. I'm getting these wierd artifacts when i move a symbol fast. It looks like it just leaves a chunk stuck to where it was. Um...how do i get rid of that?