So...here is how I am going to handle it. The flamethrower idea didn't take so I have a simple script that allows the player to kill the invasive plants while keeping collision off. I'm using the button "R" for remove. Also, I added in a decal and floatrate so the user will know that they have selected the plant for destruction.
I tried using the mouseclick condition but it always tested positive regardless of clicking the mouse.
Anyway, this works well enough:
:state=0:coloff
:state=0,plrdistwithin=100:state=1
:state=1,scancodekeypressed=19,objectinview=1:rundecal=2,floatrate=5,state=2
:state=2,plrdistfurther=101:rundecal=0,floatrate=0,state=0
:state=2,plrdistwithin=100,scancodekeypressed=0:state=3
:state=3:runfpi=disappear1.fpi