A resposta é sim você pode. Coloque as ligações em um arquivo chamado ~/.mplayer/input.config . Aqui está o meu arquivo despejado para você (com meus mods pessoais):
##
## MPlayer input control file
##
## You are able to redefine default keyboard/joystick/mouse/LIRC bindings, or
## add new ones here.
## See DOCS/tech/slave.txt for possible commands that can be bound.
## Also see mplayer -input cmdlist for other possible options.
## The file should be placed in the $HOME/.mplayer directory.
##
## If you wish to unbind a key, use key ignore.
## e.g. ENTER ignore
##
RIGHT seek +2
LEFT seek -2
DOWN volume -1
UP volume +1
PGUP seek 300
PGDWN seek -300
m mute
# switch_audio # switch audio streams
+ audio_delay 0.100
= audio_delay 0.100
- audio_delay -0.100
[ speed_mult 0.9091 # scale playback speed
] speed_mult 1.1
{ speed_mult 0.5
} speed_mult 2.0
BS speed_set 1.0 # reset speed to normal
q quit
ENTER osd #pt_step 1 1 (skip to next file (too much for an edge key))
ESC pause
p pause
. frame_step # advance one frame and pause
SPACE pause
HOME pt_up_step 1
END pt_up_step -1
> pt_step 1 # skip to next file
< pt_step -1 # previous
INS alt_src_step 1
DEL alt_src_step -1
o osd
I osd_show_property_text "${filename}" # display filename in osd
P osd_show_progression
z sub_delay -0.1 # subtract 100 ms delay from subs
x sub_delay +0.1 # add
9 volume -1
/ volume -1
0 volume 1
* volume 1
1 contrast -1
2 contrast 1
3 brightness -1
4 brightness 1
5 hue -1
6 hue 1
7 saturation -1
8 saturation 1
( balance -0.1 # adjust audio balance in favor of left
) balance +0.1 # right
d frame_drop
D step_property deinterlace # toggle deinterlacer, requires -vf yadif or kerndeint
r sub_pos -1 # move subtitles up
t sub_pos +1 # down
#? sub_step +1 # immediately display next subtitle
#? sub_step -1 # previous
#? sub_scale +0.1 # increase subtitle font size
#? sub_scale -0.1 # decrease subtitle font size
f vo_fullscreen
f11 vo_fullscreen # to match my WinVice mod, both to match FireFox - F11 full screen
T vo_ontop # toggle video window ontop of other windows
w panscan -0.1 # zoom out with -panscan 0 -fs
e panscan +0.1 # in
c capturing # save (and append) file/stream to stream.dump with -capture
s screenshot # take a png screenshot with -vf screenshot
# S will take a png screenshot of every frame
h tv_step_channel 1
l tv_step_channel -1
n tv_step_norm
b tv_step_chanlist
##
## Joystick section
## WARNING: joystick support has to be explicitly enabled at
## compiletime with --enable-joystick
##
JOY_RIGHT seek 10
JOY_LEFT seek -10
JOY_UP seek 60
JOY_DOWN seek -60
JOY_BTN0 pause
JOY_BTN1 osd
JOY_BTN2 volume 1
JOY_BTN3 volume -1
JOY_BTN4 set_menu main
##
## Apple Remote section
##
## To use OSD menu with Apple Remote, set key AR_MENU to any OSD menu command,
## or just comment out the 'AR_MENU osd' line and uncomment the line after it.
##
AR_PLAY pause
AR_PLAY_HOLD quit
AR_NEXT seek 30
AR_NEXT_HOLD seek 120
AR_PREV seek -10
AR_PREV_HOLD seek -120
AR_MENU menu up
#AR_MENU menu cancel
AR_MENU_HOLD mute
AR_VUP volume 1
AR_VDOWN volume -1
##
## OSD Menu movement keys
##
## If you are using only the keyboard it is enough to define one command (like
## "menu up"), because then that single key will display the menu, which can
## then be navigated with the cursor keys and ENTER (defined in menu.conf).
##
## LIRC users should bind each "menu" command to a button on their remote.
##
## The set_menu command directly displays the (sub)menu specified as
## its argument. Usage should be self-explanatory (although not likely
## to be needed), after reading input.conf.
##
#MOUSE_BTN0 menu up
#y menu down
#y menu ok
#y menu cancel
#y menu hide
#y set_menu general_pref
##
## DVDNAV
## Requires dvdnav://
##
UP {dvdnav} dvdnav up # DVDNav UP
DOWN {dvdnav} dvdnav down # DVDNav DOWN
LEFT {dvdnav} dvdnav left # DVDNav LEFT
RIGHT {dvdnav} dvdnav right # DVDNav RIGHT
ESC {dvdnav} dvdnav menu # DVDNav MENU
ENTER {dvdnav} dvdnav select # DVDNav SELECT (ok)
BS {dvdnav} dvdnav prev # DVDNav PREVIOUS menu (in the order chapter->title->root)
AR_VUP {dvdnav} dvdnav up # DVDNav UP
AR_VDOWN {dvdnav} dvdnav down # DVDNav DOWN
AR_PREV {dvdnav} dvdnav left # DVDNav LEFT
AR_NEXT {dvdnav} dvdnav right # DVDNav RIGHT
AR_MENU {dvdnav} dvdnav menu # DVDNav MENU
AR_PLAY {dvdnav} dvdnav select # DVDNav SELECT (ok)
#? seek_chapter -1 # skip to previous dvd chapter
#? seek_chapter +1 # next
##
## Advanced seek
## Uncomment the following lines to be able to seek to n% of the media with
## the Fx keys.
##
#F1 seek 10 1
#F2 seek 20 1
#F3 seek 30 1
#F4 seek 40 1
#F5 seek 50 1
#F6 seek 60 1
#F7 seek 70 1
#F8 seek 80 1
#F9 seek 90 1