Some functions are client side, so, easy hackable. I found the speed hack indeed affects the player movement and attack speed, so...

Attack Speed:
from: 65 01 65 01 6c 07 65 01 6c 04 a2 75 6d 07
to: 65 01 65 01 6c 07 02 02 24 ?? a2 75 6d 07
example: x4 Speed (enough for combo and killing)
65 01 65 01 6c 07 02 02 24 04 a2 75 6d 07

Walk Speed:
from: d0 66 dd 32 66 9a 04 2c ab 5a 24 01 46 94 0b 02 75 d5
to: 02 02 02 02 02 02 02 02 02 02 24 ?? 02 02 02 02 75 d5
example: x2 (enough is enough)
02 02 02 02 02 02 02 02 02 02 24 02 02 02 02 02 75 d5


If someone is interested, the auto-assemble script is done, including 'piercing' for all projectiles, rangers becomes deadly!

[ENABLE]

Aobscan(_attack,65 01 65 01 6c 07 65 01 6c 04 a2 75 6d 07)
label(attack)
registersymbol(attack)
_attack:
attack:
db 65 01 65 01 6c 07 02 02 24 04 a2 75 6d 07

Aobscan(_speed,d0 66 dd 32 66 9a 04 2c ab 5a 24 01 46 94 0b 02 75 d5)
label(speed)
registersymbol(speed)
_speed:
speed:
db 02 02 02 02 02 02 02 02 02 02 24 02 02 02 02 02 75 d5

Aobscan(_pierce,d0 2a 63 09 66 98 3b 91 63 0a)
label(pierce)
registersymbol(pierce)
_pierce:
pierce:
db d0 2a 63 09 66 98 3b 02 63 0a

[DISABLE]

Latest version (with new grinding areas)

[ENABLE]

// OK
Aobscan(_attack,65 01 65 01 6c 07 65 01 6c 04 a2 75 6d 07)
label(attack)
registersymbol(attack)
_attack:
attack:
db 65 01 65 01 6c 07 02 02 24 06 a2 75 6d 07

// MASK        d0 66 ?? 32 66 ?? 04 2c ?? ?? 24 01 46 ?? 0b 02 75 d5
Aobscan(_speed,D0 66 E4 32 66 AA 04 2C E1 5B 24 01 46 AF 0B 02 75 D5)
label(speed)
registersymbol(speed)
_speed:
speed:
db 02 02 02 02 02 02 02 02 02 02 24 02 02 02 02 02 75 d5

// MASK         d0 2a 63 09 66 ?? 3b 91 63 0a
// REPLACE      -- -- -- -- -- -- -- 02 -- --
Aobscan(_pierce,D0 2A 63 09 66 F7 3B 91 63 0A)
label(pierce)
registersymbol(pierce)
_pierce:
pierce:
db D0 2A 63 09 66 F7 3B 02 63 0A

// MASK           d0 30 d0 66 ?? 3b 4f ?? ?? 00 47
Aobscan(_wallhack,D0 30 D0 66 F3 3B 4F 90 05 00 47)
label(wallhack)
registersymbol(wallhack)
_wallhack:
wallhack:
db d0 30 02 02 02 02 02 02 02 02 47
   
// MASK           0C 06 00 00 D0 4F ?? 22 00 47 65 01
// REPLACE        -- -- -- -- 02 02 02 02 02 02 -- --                                                         
Aobscan(_manahack,0C 06 00 00 D0 4F E8 22 00 47 65 01)
label(manahack)
registersymbol(manahack)
_manahack:
manahack:
db 0C 06 00 00 02 02 02 02 02 02 65 01

// MASK             46 ?? 05 02 68 ?? 32 5e ?? 22 27 68 ?? 22 47
// REPLACE          -- -- -- -- -- -- -- -- -- -- 26 -- -- -- 02
Aobscan(_chargemana,46 BB 05 02 68 F7 32 5E DA 22 27 68 DA 22 47)
label(chargemana)
registersymbol(chargemana)
_chargemana:
chargemana:
db 46 BB 05 02 68 F7 32 5E DA 22 26 68 DA 22 02

// MASK              12 06 00 00 29 d2 66 ?? ?? 76 12 41 00 00
Aobscan(_quickcharge,12 06 00 00 29 D2 66 9A 29 76 12 41 00 00)
label(quickcharge)
registersymbol(quickcharge)
_quickcharge:
quickcharge:
db 12 06 00 00 29 26 02 02 02 02 12 41 00 00

// MASK          d2 d0 ?? ?? 3b 0f 02 00 00 27 48
// REPLACE       -- -- -- -- -- -- -- -- -- 02 02
Aobscan(_multhit,D2 D0 66 FC 3B 0F 02 00 00 27 48)
label(multhit)
registersymbol(multhit)
_multhit:
multhit:
db D2 D0 66 FC 3B 0F 02 00 00 02 02

// OK
Aobscan(_recur1,63 08 D0 D1 62 08 25 E8 07)
label(recur1)
registersymbol(recur1)
_recur1:
recur1:
db 63 08 d0 d1 62 08 25 ee 05

// MASK         d3 66 ?? ?? d0 66 ?? ?? 25 e8 07
// REPLACE      -- -- -- -- -- -- -- -- -- 88 27
Aobscan(_recur2,D3 66 8A 3C D0 66 FD 3B 25 E8 07)
label(recur2)
registersymbol(recur2)
_recur2:
recur2:
db D3 66 8A 3C D0 66 FD 3B 25 88 27

[DISABLE]

multi-hit & recurring hit hack = projectiles now hits 2 to 5 times the same target when pierce!