It would be nice to have the ability to set a blink rhythm for the LED.
For example. You can set the duration by milliseconds, then enter something like 10100010 
If duration is 5ms, then the LED would blink L
   on for 5ms 
   off for 5ms
   on for 5ms
   off for 15ms
   on for 1ms. 
(Not adding a 0 at the end would leave the LED on.)
This could adapt to TWINE 2 where perhaps there would be a multi-color LED, so G0R0B could be used
                
                             
         
     
 
                 
             
        
Answers
Steady light for x seconds
Or
blink x number of times.
With the advanced options allowing to set the parameters of the light such as Ms on and Ms off per flash.