Very good questions and remark regarding motion of the map.

Let's start with the remark: I have removed animation for moving the map while you navigate. As a result, we should get way smaller swing of position indicator on the display.

Speed limit signs: assuming that its enabled in navigation page (the one where you press Begin) and assuming that you have OSM Scout Server installed, maps downloaded:

this means that the road that you were traveling upon does not have speed limit info in OSM database. In Estonia, we have rather good coverage and these data are usually in the parts of the road where the speed is limited when compared to default. For example, if its 30km/h instead of 50km/h in the city. To fix it, start entering the data into OSM and I will pick it up when the imports are done.

Direction signs: again, its all about missing data in OSM. These are tricky, usually are on highways in the countries with the great coverage. I enjoyed them in Sweden and Denmark. In Estonia, haven't seen any on my routes. Again, start entering the data. See https://wiki.openstreetmap.org/wiki/...stination_sign and explore http://k1wiosm.github.io/checkautopista2/