Hy Scott,
the 1:50 scale limit is coded and can't be changed without changing the code.
In few words you have to:
1- duplicate "Zone_stamp 18" and "Zone_stammp_macro" with save as, let's say "My stamp" and "My stamp macro".
2-Enter gdl code, master script, of My stamp and change:
call "Zone_stamp_macro" parameters all gs_iDisplayStandards = gs_iDisplayStandards
into
call "My stamp macro" parameters all gs_iDisplayStandards = gs_iDisplayStandards
3-In My stamp macro go to master script and change:
if GLOB_SCALE < 50 + eps then _iScale = SCALE_50
into
if GLOB_SCALE < 32 + eps then _iScale = SCALE_50
4-In My stamp macro go to master script and change:
dim stDisplayScale[3]
stDisplayScale[1] = `1:50`
into
dim stDisplayScale[3]
stDisplayScale[1] = `1:32`
I think that will get the work done.