Problem to assign default buttons in retromain.c about mame2015-libretro HOT 9 OPEN

OutRunners (orunners) has the same problem, Input (this Game):

P1 Button 1: Kbd SPACE --> shift up, should be retropad R
P1 Button 2: Kbd LSHIFT --> shift down, should be retropad L
P1 Button 3: Kbd Z --> change radio station (mega radio station)
P1 Button 4: Kbd X --> change radio station (left)
P1 Button 5: Kbd C --> change radio station (right)

from mame2015-libretro.

After Burner II, general input:

AD Stick Z Analog Dec: Kbd A --> should be retropad L
AD Stick Z Analog Inc: Kbd Z --> should be retropad R

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Regarding general input:

<sergio-br2> I'm playing Super Monaco GP, I can see the Shift Down and Shift Up in the Input (this Game)
<sergio-br2> but I can't find these buttons in the general input
<sergio-br2> seems they are not any of buttons 1 to 16
<Tafoid> In the TAB menu -> Input (This Machine) they are listed as A and Z
<sergio-br2> but just in the "this machine"
<sergio-br2> I'd like to know what's the correspondent to general
<Tafoid> There is no global shifter assignments, no
<sergio-br2> there are for mahjong, but not to shifter... uh
<Tafoid> shifters are not always digital.. mahjong panels are

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Special Criminal Investigation (World set 1), for some reason it's assigning shifter and turbo to the same key. The same thing happens with daytona

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Slip Stream (slipstrm)

Gear Change: Kbd Space

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Speed Racer (speedrcr)

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Rave Racer (Rev. RV2, World), (raveracw)

Shifter is assigned to UP and DOWN

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A.B. Cop (World, FD1094 317-0169b), (abcop), A is assigned to both jump and pedan inc

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Big Run (11th Rallye version), (bigrun), A is assigned to both P1 Brake and P1 Pedal 1Inc.

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