I've been wondering whether it's doable. By default it is mapped to "Enter" and RMB - which is fine if you're using mouse (and also familiar if you're Rhino user).
But it's not so cool if you're using MoI with graphics tablet - you either need to move your hand over to Enter or use one of those flimsy buttons on the pen (or use buttons on the side panel). I'd love to map it to "Space" key as it would allow me to confirm / launch last command without any extra hand movement.

Hi Przemas, in moi.ini you can find this setting:

[UI]
<....>
TreatSpaceAsEnter=n

If you switch that to =y then it should behave like you're asking.

It could also be possible to set it on a different key by setting up a shortcut key with some script on it.

- Michael

You should also be able to reprogram your pen to use its left/right/tip/eraser to be anything you want; including enter.

Awesome! Thank you - exactly what I've been hoping for. With this using graphics tablet is way nicer.