Hey Dave,
For your brake problem, have you tried editing the fsx.cfg file?
It should be located here for XP:
C:\Documents and Settings\Administrator\Application Data\Microsoft\FSX\fsx.CFG
You may use a different user name than Administrator. If so, then switch the name you use for "Administrator" in the file location above.
Also, make sure you have hidden files visible.
Open fsx.cfg with notepad.exe and find the part that says:
InfoParkingBrakesEnable=
and make sure its says:
InfoParkingBrakesEnable=True
Save and close.
This will load every flight with the parking brakes On by default.
As far as the Idle problem, you should uninstall the Saitek drivers for your X52 via this guide:
http://www.saitek.com/uk/supp/saitekUninstall.htmThe X52 should still operate without drivers installed, but you may not get full control of all the joystick lights just yet.
Open FSX with your X52 unplugged.
Go to the Control Setting screen and check all the buttons or sliders (keyboard and controller) associated with throttling. Delete all of the button/slider associations you have currently.
Close the Settings screen by selecting OK.
Shut off FSX and restart it. This will save your current configuration.
Load an airplane to verify that there is no button activating throttle up via the keyboard.
Shut down and plug in your X52 (no Saitek drivers).
Open Control Panel, Game Controllers and Calibrate your joystick throttle slider.
Start FSX and repeat loading an aircraft to make sure Windows Game Controller drivers are not forcing a throttle up through an X52 button or slider.
If both of the tests work, then you can go about reassigning the buttons and sliders that you choose to throttle up and down via the Controls Settings screen.
Reinstall the latest Saitek drivers for the X52 and see if the button settings follow. If not, then you can reassign your X52 settings via the Controls Settings screen in FSX.
The reason for doing it like this is that Windows game controller settings sometimes supersede or conflict with Saitek settings and force unpredictable results.
Hope this helps.