Re: Finishing the season
I would think that if your shoulder is ok again, you should be able to maintain some overall general strength but working the Upper Body – (even if not leg specific work), so I wouldn’t be overly concerned, though personally I’d try and avoid too many hamstring curls this late in the season.
Anyway at this stage in the season most players and coaches can make the mistake or giving into temptation and overtraining or pushing too hard when the opposite is more often more effective after a long punishing season – so ironically you might be fresher than many of your team mates if you are lucky.
Like Ashley says work on the regeneration side of things (perhaps some core work may help with the back injury) and peak for the finals.
Best of Luck