In that case, set PSLTSCALE to 1 and LTSCALE to 1 (or 0.5, or whatever fraction of your DIMSCALE you usually use).
What does the 0.5 represent?
Okay I was stayin' out cuz' it seemed to be covered, but....
First-
Linetypes are defined in the acad.lin file and each "dash" or "gap" is given a length. When placed in a drawing that length is then multiplied by the LTSCALE to display the linetype.
Okay so far.
In the past, those of us who used the ACAD.LIN file OOTB had to figure out how LTSCALE related to DIMSCALE, the scale to which we were to plot. After some faniggling, many of us came to the conclusion that setting LTSALE to half (some a third) of the DIMSCALE (or plot scale) setting provided an acceptable plotted linetype. So if you were doing a 1/4" =1'-0" scale draing, your LTSCALE would be 24.
Still with me?
Okay, now comes along paperspace (R11) and we need to display the linetype at different scales in differently zoomed windows. We want the dashes to be the same plotted length whether we zoomed to 1/48xp or 1/12xp. The PSLTSCALE variable does that, if it's off, zoomed in dashes look longer, if on they plot the same length in all viewports.
BUT, what do we do with LTSCALE? Well in paperspace your plot scale is usually 1:1, so if the same concept holds true from earlier stuff we need the LTSCALE set to half of the plot scale or 0.5.
So now the linetypes are determined by the ACAD.lin file then multiplied by the zoom scale factor of the vieport (PSLTSCALE=1), and then multiplied by LTSALE of 0.5.
Piece 'o cake.