You can attribute more lab than the maximum for a scientist :

The game doesn't check if you the number typed in assign research research facilities is too big compared to the max labs of the selected scientist.
Also quality of life suggestion : If you have say 10 research lab available, and you click on a scientist with only 5 max labs, assign research facilities automaticly goes to 5, wich is great.
But when you click on another scientist wich has more than 5 max labs, assign research facilities doesn't automaticly update to the maximum number of labs you could assign, wich would be nice.