Update from IRC:
< _wb__> EvilDragon: any word from the case company yet about the viability of 6 action buttons?
<@EvilDragon> _wb__, No, but I don't see a reason why it shouldn't owrk.
< _wb__> EvilDragon: what layout will the 6 buttons have? Pandora buttons plus two to the northeast of Y and B ?
<@EvilDragon> Nope, above and below the current A.
<+B-ZaR>
< TrashyMG|Work> distanced enough not to interfere with nub use?
<@EvilDragon> Small enough.
< _wb__> so...
< TrashyMG|Work> ah smaller buttons?
< _wb__> C Y
< _wb__> A B
< _wb__> Z X
<@EvilDragon> _wb__, Yep.
<@EvilDragon> On the other side, it would interfere when pressing X or B.
This means the proposals in this poll will need to be reconsidered. Here is a first attempt to modify them:
1) Pandora layout + C and Z
C Y
A B
Z X
2) Pandora layout + two extra buttons
(here shown as C1 and C2 but this could also be Z1 and Z2 or something like that)
C1 Y
A B
C2 X
3) SEGA-style
Y Z
X C
A B
???
4) Extended SNES
Y X
Z A
C B
5) Colored letters
(the other proposals can be colored too, but for this one it is obligatory)
M Y
C B
R G
6) Directions + extra buttons
X1 N
W E
X2 S
7) Greek letters that look a bit like Playstation layout
Φ Δ
Π Ω
ψ χ
8) Pandora-like (lowercase) Greek layout
μ γ
α β
ν χ
9) Dice symbols
⚀ ⚁ ⚂ ⚃ ⚄ ⚅ in some order (without the boxes around the pips)
10) Various PlayStation-inspired symbols
⌂ ⚇
≡ ✓
← ✗
11) Playing card symbols + red/black
R ♥
♦ ♣
B ♠
or
R ♣
♦ ♥
B ♠
12) Chess pieces
♔ ♗
♙ ♘
♕ ♖
13) Media buttons
[play] [back]
[prev] [next]
[stop] [forward]
14) Roman numerals
I II
III IV
V VI
or some other ordering
15) Just label them with their keyboard mapping:
[ins ] [PgUp]
[Home] [End ]
[Del ] [PgDn]
16) No labels at all
17) Alphanumeric combinations
G5 G6
G3 G4
G1 G2
or some other ordering
18) Arabic numbers:
5 1
2 3
6 4
or some other ordering
This new information may also inspire people to come up with new proposals...