P.S. “Custom key” from the main menu should also help.

Yeah, looks it was not intentional. This is the keymap that will be useful when you are using emulators, i.e. the space key should be under your thumbs. I completely forgot the classic Spectrum 48 space key is located on the bottom right. That is why the classic Spectrum “fire” is the “M” key usually.
But yes, you can run this on 48+ or 128 models, they have a more human spacebar.

It’s just a very different experience from what I’m used to computer wise.. and that tiny space bar!!

I think I might buy one, the 128+ looks pretty sexy with the external heat sink but it seems there is so many 48ks that they are much easier to get a hold of