You can program key strokes and functions in the ENV file. Cant remember the basics, but for regular tasks I programed a set of key strokes as shown below, which will answer your question on changing widths.
# m = move a component or element
# r = rotate a component or element 90 degree's CCW
# t = change to oposite layer
funckey m move
funckey r iangle 90
funckey t pop mirror
funckey p place manual -h
# l = route a connection or cline
# s = slide a connection or cline
funckey l add connect
funckey s slide
funckey v pop bbdrill
# w + number Enter = set route width to number in current units
# eg. ww8 sets width to 0.008" if units are mils
alias ww "setwindow form.mini;FORM mini acon_line_width"
# wX sets route width immediatley to value following the number
funckey w7 "setwindow form.mini;FORM mini acon_line_width 7"
funckey w8 "setwindow form.mini;FORM mini acon_line_width 8"
funckey w10 "setwindow form.mini;FORM mini acon_line_width 10"
funckey w15 "setwindow form.mini;FORM mini acon_line_width 15"
funckey w20 "setwindow form.mini;FORM mini acon_line_width 20"
funckey w25 "setwindow form.mini;FORM mini acon_line_width 25"
funckey w35 "setwindow form.mini;FORM mini acon_line_width 35"
funckey w50 "setwindow form.mini;FORM mini acon_line_width 50"