You can use the touch plugin
------------------------------------------------------------
global number speed = 25
condition: on double-tap gesture on (object_name)
action: set global variable (i.e., speed) to 100 or Add 25 to global variable (i.e., speed)
Wait 3.0s
set global variable (i.e., speed) to its initial value or subtract 25 to global variable (i.e., speed)
you can try different combinations =)