This posting is older than 6 months and can contain outdated information.
Please allow me to just copy and paste a previous answer of mine to
the same question:
RB's Wiimote driver will automatically assume a button release as soon
as you press another button without releasing the other one first.
Reason being that *many* actions will - due to their nature - not be
able to work correctly or at all if they are executed at the same
time. F.ex. while pressing several keys at the same time is desirable
for games, it is not for applications:
If one action sends a keystroke Apple + K and another one Alt + R, the
keystroke will end up as Apple + Alt + K + R - with unknown and
possibly unwanted effects.
There are even more problems if you'd try to concurrently run two
AppleScripts targetting the same applicaton.
The current implementation ensures that none of these problems can
occur.
Best regards,
Felix