All of you who played cs should remember the good old he maps where you have to frag your enemy using just nades. There were plenty of different maps which offered he training, in UrT however I haven't seen such a map once. I also have seen that most people around here know how to aim, have at least some basic movement but no clue who to use their nades in a good way (timing, taking it back, throwing in general), such a map could improve the nade skills.
Several mappers around here told me that it is possible to put weapons on the ground and therefore it should be possible to create such maps in UrT as well.
So the request should be simple:
A map which is just a square room, separated by a glass wall, the teams spawn on the different sides and a lot of grenades are lying around on the floor.