thanks for asking.

You can indeed do this already with the virtual keyboard in two ways:

1) by invoking the virtual keyboard with the remote (you can assign 
this it to any button as you please) - it works with a mouse, too, 
so it should just as well with a tablet.

2) by using the shift/command/alt/ctrl toggle actions provided by the 
Virtual Keyboard. This will emulate holding the respective modifier 
keys until you press the same button on your remote again.

Please have a look at the Online Help's "How-To" section for a 
general description on how to change the mapping of actions to the 
buttons on your remote in different contexts.

Best regards, 
Felix