AutoCAD LT :: Paper Space View Port Scale

I have a drawing in model space the i drew to scale of 1'=1' and I went to paper scape to put the drawing in my title block using Viewports. highlighted the viewport and went to properties to give the drawing a scale so it would maximize the Viewport area, on my 22"x34" paper.  but under the standard scale 1/64"=1' is too big and 1/128"=1' is too small.  the simple solution is zoom extents but then in my title block i have to put NTS.  I would like to add to the standard scale or be able to set the customer scale to a whole number. EX. 1:1000 or 1:150, etc. etc.