Ah, maybe i would make the opposite mistake if it switched back to probe :D. It is possible that the solution is to make it more clear what is about to be used then, but will have to try and see.
Sounds good with the endless levels focusing on a few types. What i would like to see is the limit on how many of a particular type that is allowed to be pushed up, especially if that mine is chosen to be what the level focuses on. Something like a large ammount of ultimine, batteri or even mortars could completely change the gameplay and feel refreshing.