Totally depends on your goals. If you don't want to win games sure go ahead and don't train stamina/FT. If you do want to win games, it can be worthwhile to train stamina in the weeks with just 2 games total or when minutes are screwed because of injury/foulout.
2 position training is very roughly about 30% slower than the 1 position equivalent. As said, rebounding, 1vs1 and jumpshot don't have 1 position equivalents so the comparison stops there.