You asked me to post them here as a list, so without further ado:

1. Make a powered launcher launch continousley, and not only once
   1.a Create a way, a dispensed cart starts moving immediately (this cooincides with the launcher, as that could make it so)
2. Devise a system to hold a cart on a certain block for a certain amount of time (as defined on a sign). Can be the station block with the amount to hold for on the fourth or so line.
3. Make a block-type that either removes the minecart entitiy if it passes over it and is empty, or give chests the options if theyre placed next to tracks (with some distance maybe if possible) to collect empty carts.

4.Make a block-type that holds the cart with player on it and "ask" the player to type out where he wants to go eg. /left,/right,/up,/down. (I dont really like that, I want to keep commands away from players, but has been requested by a player)

5.Create a IC (SISO) that generates a clock when inputs goes into high state. (also a request from a player, cannot say if its feasible)

Thank you!

1. Done. Put "Push" on last line.
2. http://www.assembla.com/spaces/craftbook/tickets/73-add-the-ability-for-minecart-station-blocks-to-hold-for-some-time
3. http://www.assembla.com/spaces/craftbook/tickets/74-allow-chests-to-pick-up-empty-minecarts-that-pass-by
4. http://www.assembla.com/spaces/craftbook/tickets/1-add-minecart-stop-blocks
5. Added, but not yet reliably loaded on chunk load yet.