> [...] it gives zero clues on the creativity of the candidate.
I wasn't going to tailor my CV to your company anyway (and I haven't met a single human being in my field that does). At least this way you can be sure it is readable and contains relevant information.
> [...] creating a document is a skill that is a must have in our field.
Which should be done with latex, or at the very least another standardised markup language. Not anything which might remotely approach "creative" (i.e. indesign or photoshop).
> If the CV isn't structured, contains spelling mistakes (yes, really) or shows you have no clue on how to use a text-processing software, then it's already a negative point for said candidate (IMHO).
You are essentially pre-selecting for people that share your cultural background. That makes this (IMHO) a racist hiring policy. You should always look at why you feel certain indicators are good indicators. And what you might be missing out on by weighing them as you do.