Trigger - if mouse button held for certain period of time?

[stupomer]

HI Gintaras,
Thank you for your super quick responses on my flood of questions.
Can a trigger be if a key or mouse click is held down for a certain period of time?
Sometimes middle mouse triggers can get triggered when using the mouse wheel.
It would be nice to make it a little harder to activate - i.e. held down for 0.5 sec or something

Thanks,
Stuart