If you always want to start OO with the same file, you could include it as a parameter after "debbie ooffice", with full path.

If you don't abhor the command line, the most efficient way IMO is to define a shortcut
After adding this line to your /home/user/.profile, you can open any file that OO can handle by typing "oo filename" in Maemo's XTerminal (that is, the next time you launch it). If you are curious, the readlink hack in the above is needed because the chroot generally changes your working directory, and "readlink -f" returns the full path name.

Similarly, for gnumeric add e.g.
Consult the wiki for more extensive info!