This is probably in the manual, but I thought I would pass it on just in case others didn't realize this. After growing to love the weather map filter in AJE, on a whim I tried it in RUS. It worked! To toggle this filter on/off, hit the number '8'.
The terrain filter '7' does not work, however, but that is less needed anyway since one has a pretty good idea just from the map details already. The weather filter is awesome, because I am always failing to note the weather without it.
By the way, I also only recently learned that each number key corresponds to the map filter buttons on your GUI, with Military Control = 1, Supply = 2, and so on. Probably also in the manual.