3 point by default, find this line
(setq useleader 0) ; use a leader with text 0=no
change 0 to 3
Preset DimStyle, find this
(setq cur_dim (getvar "dimstyle")
cur_dim_old cur_dim
) ; save curent Dim Style
Change to this
(setq cur_dim_old (getvar "dimstyle")
cur_dim <your dim style>
) ; save curent Dim Style
Let me know if that doesn't work, cause I didn't test it.