You say you can not do much because your hands are tied? Leadership does not come with a title but rather with quality of character.
1. Talk to the person in charge and share your ideas, encourage them, share your concerns in a non-judgemental way. We cannot only influence those under us but those above us as well.
2. Training others takes patience and time. For me I find out their ability to commit and/or their level of commitment and work from there. If they can not commit to practices and we as a team have set that as something we value then they won't be playing but perhaps hey could do something else? Run projector, or do specials, or ????
3. Don't lower your standards or expectations, this is of course assuming they are reasonable. We train people and unfortunately many smaller churches in an effort to get more help have lowered the bar to the point that we can walk over it.