First I'd like to start off by saying that I think the practice tool is a very nice implementation for the game. I would like to lay on the table some suggestions for perhaps possible improvements.
1. Option to change summoner spells, runes and champions in-game.
2. Option to practice with at least one other player.
3. If suggestion #2 is implemented, both players could have all the tools available at their disposal. A suggestion for this could be to have both players seeing the toolbar on the left, with there now being an additional line with the tools for the player on the blue team on the left side of the line and the player on the red team on the right side of the line.
4. Option to fill up to 5 slots (or perhaps 6, as in Hexakill) on both teams.