CycloDS had RTS for god's sake. ...but then again, Cyclo and DSTwo have specific teams which support the product, unlike the R4 which is...pretty much a free-for-all what with the clones. So it can be forgiven.
One thing that always bothered me with RTS is how it crashes the game if you do it many times. Also some games can't do RTS until you load the respective save file. (looking at you, Harvest Moon and Final Fantasy!) It's safer to ...just stay away from RTS.