I noticed that the ! _Line _Normal command does not remember the last used value, which is quite strange, considering that it would make it much more convenient to use when repeating the command multiple times. I’m forced to enter a numerical value every time I run the command, which takes a lot of extra time and effort. I wonder if there is a way to modify the macro so that it will enter the same value as the last used one? If not, then consider this is a wish for future Rhino releases. 
Not sure if this helps. If you always make lines of the same length it could:
! _Line Normal Pause Pause 15
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Cool. That helps with a single value that needs to be repeated. However, it requires modification of the icon’s command every time a different value is needed. I suggest to consider adding a Command line option to remember the value, just like many other commands do.