Modifier Keys, dynamically

[bgks]

Is there something like a best practice guide, how to handle modifier keys when building custom (driverless) application profiles?
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I don't suffer problems using the check-boxes to add modifier key behavior to axis operations. I see the modifier keys on my SpacePilot modifying keys being pressed on the physical keyboard. Though, pressing modifier keys on the SpacePilot seems to break keystroke function bound to SpacePilot's axes. Pressing modifier keys on the keyboard modifys the keystroke action bound to axes, again.
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Does the behavior depend on the operating system being used or of certain applications? Is it specific to the device or my keyboard? Is this an issue that will be fixed during the beta phase? At least, I don't see, why the modifier keys on the SpacePilot should behave different from those on the keyboard.