If you want to control individual timers, then I recommend using the vizact library, specifically, the vizact.ontimer function. Here is some sample code that creates a simple timer and uses the keyboard to toggle it on/off:
Code:
import viz
viz.go()
def DoSomething():
print viz.getFrameNumber()
#Create timer that calls 'DoSomething' every 1 second
mytimer = vizact.ontimer(1,DoSomething)
def ToggleTimer():
mytimer.setEnabled(viz.TOGGLE)
#Toggle timer on/off when spacebar pressed
vizact.onkeydown(' ',ToggleTimer)