First of all, if you're booting straight into X and have a graphical session, you can get into terminal mode by pressing CTRL-ALT-F1 or CTRL-ALT-F2... depending on the virtual terminal you want to use. Normally you have six setup by default, therefore, if this is the case, to get back to your X session, you would press CTRL-ALT-F7.
As far as mouse configuration programs Redhat supplies a "mouseconfig" tool that lets you configure your mouse from the console. I don't know for sure if Mandrake has it, but it may.
If you don't have mouseconfig, the file that controls your mouse, at least with Redhat (yours should be similar) is /etc/sysconfig/mouse. For X, the mouse is configured in the /etc/X11/XF86Config file. I think the XF86Setup and the xf86config program will allow you to change X mouse settings (Backup your current XF86Config file before using these though).
You can find more information on X at:
Item 40. Item 28 gives a rundown of some system configuration tools.
For mouse and system configuration file information:
I hope this helps.