In fact this is the opposite. if your shape got a 1px (or any uneven size) stroke then your points should be aligned not on a round pixel but on a x.5 pixel. Why that ? Because the strokes in svg are drawn 50% inside the shape and 50% outside (in svg 2 you will be able to draw the stroke fully inside or fully outside). So if you draw a rect filled in blue with black strike starting at 10,10 over a white background then it will draw a grey line (50% white + 50% black) at 9[=>10] and a dark blue line (50% black + 50% blue) at 10[=>11]. If you draw it at 10.5 then the background will be white at 9 (till 10) there will be a black line at 10 (till 11) and a blue background at 11.
One solution could be to double all coordinates and width = draw a 2px stroke at 20 => this will draw 1 full black line at 19 and another full black line at 20. When exporting make sure to halve the value (ex design at 48*48 but export at 24*24) and you should be fine.
When designing make sure you are using even number (= 2x whate the base value would have to be)
There's an extension too that should do grid fitting if you still want to use a 1:1 ratio but I don't remember its name
I can't wait for svg 2 to be adopted so that we don't have to care anymore with all this mess