glboom -playdemo 30uv1441.lmp -warp 29
glboom -playdemo 30uv1441.lmp -skipsec 192

glboom -iwad doom.wad -playdemo e1uv-405.lmp -warp 1 6
glboom -iwad doom.wad -playdemo e1uv-405.lmp -skipsec 12.5

glboom -timedemo e4uv-232.lmp -framescapture 1 frm

several additional key-bindings and settings available:
1) Main Menu\Options\Setup\Key Bindings (on last page)

   GAME SPEED
     Speed Up                - PAD+
     Speed Down              - PAD-
     Step of Speed Change    - 10
     Set Speed to Default    - PAD*
   PLAY DEMOS
     Next Level              - PgDn
     Walk Camera             - Alt
   RECORDING DEMOS
     Join                    - Alt

2) Main Menu\Options\Setup\Status Bar / HUD (on last page)

   ADDITIONAL
     Show GameSpeed          - yes/no 
     Show LevelTime          - yes/no
     Secret Areas            - yes/no
     Smart Totals            - yes/no
     Permanent Strafe50      - yes/no
     Strafe50 on turns       - yes/no
   CHANGE PALETTE
     on damage               - yes/no
     on bonus                - yes/no
     on powers               - yes/no

3) See "a.bat" for understanding how to use rerecord feature