Marking timeslips as "unbillable"

Sorry if I'm repeating something that's been raised before here. I found a few topics from 8 months to over a year ago discussing the exact same thing, but no conclusive "yes we're going to do that".

I very often have projects that for some reason or another don't bill according to my timeslips. In fact, I'd say pretty much every project I do needs a bit of "bodging" to get it to the right price.

Therefore I would love a way to mark unbilled time as "unbillable" so when I create an invoice with my slightly creative methods then I can just write off the timeslips.

Like I say, there's a few other discussions on these boards, but are there any plans in the pipeline?

Thanks