I'm really glad that this is a feature (I've been pining for something like this in Tapas for a while now), but I'm having a problem with the formatting. I wasn't sure if I should post it here or in technical support.
When I do inline italicising, there's a line break above and below the italicised font. So instead of:
The text looking just like this.
I get:
The text looks
exactly
like this.
And there's no way to fix it. If I try to delete the space to bring the formatted text back into the sentence normally, it just deletes the characters in front of or after it, but the formatted text itself never moves.