LOLZ_NORMAL is just a preset of lolz.
You can use lolz just normal like you want.
Example: srep+lolz:d32:mt8
Code:
LOLZ_FAST = lolz:d<expr:((0.25*freememory/11)-(32*1048576*2))/min(thread,16)/1048576>:mtt1:mt<expr:min(thread,16)>:fba4096:mc2
LOLZ_NORMAL = lolz:d<expr:((0.45*freememory/11)-(32*1048576*2))/min(thread,16)/1048576>:mtt1:mt<expr:min(thread,16)>:mc1023
LOLZ_HIGH = lolz:dtb1:d<expr:((0.65*freememory/11)-(32*1048576*2))/min(thread,16)/1048576>:mtt1:mt<expr:min(thread,16)>:mc1023
LOLZ_ULTRA = lolz:dtb1:d<expr:((0.85*freememory/11)-(32*1048576*2))/min(thread,16)/1048576>:mtt1:mt<expr:min(thread,16)>:mc1023
For xt91 it is possible aswell but you have to make changes in DSG_Arc.ini + DSG_Methods.ini, because it would be a whole new method.