Add texture strength slider to the pop-up pallette. Texture strength is one of the good options to experiment with so adding slider to the pop-up pallette will be very useful.
We probably should have policy which options we can add there and which not... I remember people asking for pattern scale, too, for example. Although, the only problem is that it needs to be added separately in the code. Since users can put and remove sliders from the popup palette area, having more options available shouldn't be a problem.