_comandline rendering for mentalRAY

hi all folks!

im doing currently renderings for matte in mentalray (maya 5.0.1)

because i still need to work on windows of coarse we have memory problems, so we decide to render when maya is off.

what we use to render the maya file (MentalRAY)
is as wirtten in command line example:

1) cd "Eigene Dateien\maya\projects\seven_one_handyportal\scenes \"

2) set maya_install_path=C:\Programme\AliasWavefront\Maya 5.0

3) mayarender_with_mr -batch -file render_001_intro.mb

than mutch faster and without timeouts Maya starts to render only in command window

But the problems i still have are:

- no alpha channel is rendered (in renderwindow when maya runns he renders the alpha why not in commandline!?)

There are not enouhg flags available to define exactly what i want render from the .mb flie...

here: this comes out when trying to get the flags:

Command: "C:\Programme\AliasWavefront\Maya5.0\bin\mayabatch " -test -command mrBa
tchRender_v5

Flags:
-v prints the product version and cut number
-batch for batch mode
-prompt for interactive non-gui mode
-proj [dir] look for files in the specified project dir
-command [mel command] runs the specified command on startup
-file [file] opens the specified file
-script [file] sources the specified file on startup
-log [file] copies stdout and stderr messages to the specified file

(use complete file name)
-recover recover the last journal file
-render [file] renders the specified file
(use 'Render -help' for more options)
-optimizeRender [file] [outfile]
optimize maya file efficient for rendering
purposes, and put result in outfile
(use 'maya -optimizeRender -help' for more options)

-archive [file] displays a list of files required to archive
the specified scene.
-help prints this message

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if here is some professionals who can give me tipps where this flaggs are would be very nice!

i do not have a programmer by my side, so i do lack in this thins...
im modelling and rendering but still have to learn tonns of stuff in mentalray....