Some more investigations. There is a function which calculates lamfa_w variable. This variable clipped by hardcoded value 0x1000 which means 1.0 lambda value.
But code can be patched. Just replacing of 1000h with 1100h in three places allows to increase lamfa_w value to 1.1. I didn't do road tests maybe there are limitations if different places but they also can be found.
ROM:0008AA6E LAMFAW: ; DATA XREF: ROM:00011380o
ROM:0008AA6E mov [-r0], r9
ROM:0008AA70 mov [-r0], r8
ROM:0008AA72 mov r4, mrfa_w_0
ROM:0008AA76 mov [-r0], r4
ROM:0008AA78 movbz r5, nmot40
ROM:0008AA7C mov [-r0], r5
ROM:0008AA7E mov r4, #3930h
ROM:0008AA82 mov r5, #8
ROM:0008AA86 mov [-r0], r5
ROM:0008AA88 mov [-r0], r4
ROM:0008AA8A mov r4, #3924h
ROM:0008AA8E mov r5, #8
ROM:0008AA92 mov [-r0], r5
ROM:0008AA94 mov [-r0], r4
ROM:0008AA96 extp #8, #1
ROM:0008AA9A movbz r12, byte_23912
ROM:0008AA9E mov r13, #3914h ; LAMFA
ROM:0008AAA2 mov r14, #8
ROM:0008AAA6 extp #8, #1
ROM:0008AAAA movbz r15, byte_23913
ROM:0008AAAE calls 4, sub_428E2
ROM:0008AAB2 add r0, #0Ch
ROM:0008AAB6 movbz r8, rl4
ROM:0008AAB8 shl r8, #5
ROM:0008AABA cmp r8, #1000h
ROM:0008AABE jmpr cc_NZ, loc_8AACA
ROM:0008AAC0 movb byte_3008A6, ZEROS
ROM:0008AAC4 mov r9, #1000h
ROM:0008AAC8 jmpr cc_UC, loc_8AAE6
ROM:0008AACA ; ---------------------------------------------------------------------------
ROM:0008AACA
ROM:0008AACA loc_8AACA: ; CODE XREF: LAMFAW+50j
ROM:0008AACA movb rl4, byte_3008A6
ROM:0008AACE extp #6, #1
ROM:0008AAD2 cmpb rl4, byte_19C58
ROM:0008AAD6 jmpr cc_NC, loc_8AAE4
ROM:0008AAD8 addb rl4, #1
ROM:0008AADA movb byte_3008A6, rl4
ROM:0008AADE mov r9, #1000h
ROM:0008AAE2 jmpr cc_UC, loc_8AAE6
ROM:0008AAE4 ; ---------------------------------------------------------------------------
ROM:0008AAE4
ROM:0008AAE4 loc_8AAE4: ; CODE XREF: LAMFAW+68j
ROM:0008AAE4 mov r9, r8
ROM:0008AAE6
ROM:0008AAE6 loc_8AAE6: ; CODE XREF: LAMFAW+5Aj
ROM:0008AAE6 ; LAMFAW+74j
ROM:0008AAE6 jnb word_FD7C.13, loc_8AB10
ROM:0008AAEA mov r12, #1C4Bh
ROM:0008AAEE mov r13, #6
ROM:0008AAF2 movbz r14, nmot40
ROM:0008AAF6 calls 4, LookupI_41cee ; References a lookupI table
ROM:0008AAFA movbz r4, rl4
ROM:0008AAFC shl r4, #5
ROM:0008AAFE mov r5, r9
ROM:0008AB00 sub r5, r4
ROM:0008AB02 jmpr cc_NC, loc_8AB06
ROM:0008AB04 mov r5, #0
ROM:0008AB06
ROM:0008AB06 loc_8AB06: ; CODE XREF: LAMFAW+94j
ROM:0008AB06 extp #0C1h, #1 ; '+'
ROM:0008AB0A mov lamfa_w, r5
ROM:0008AB0E jmpr cc_UC, loc_8AB18
ROM:0008AB10 ; ---------------------------------------------------------------------------
ROM:0008AB10
ROM:0008AB10 loc_8AB10: ; CODE XREF: LAMFAW:loc_8AAE6j
ROM:0008AB10 extp #0C1h, #1 ; '+'
ROM:0008AB14 mov lamfa_w, r9
ROM:0008AB18
ROM:0008AB18 loc_8AB18: ; CODE XREF: LAMFAW+A0j
ROM:0008AB18 mov r8, [r0+]
ROM:0008AB1A mov r9, [r0+]
ROM:0008AB1C rets
ROM:0008AB1C ; End of function LAMFAW