The mz50 has continuous motorwind, so will do what you want. It also has the option of fully manual exposure mode so fits that requirement. Sounds like you're better off sticking with what you've got and using its existing features. The mz50 isn't particularly bulky by SLR stadards. Sure, a rangefinder is smaller, but not by that much, especially if you use a prime (i.e. not a zoom) lens on your mz50. Rangefinders have prime lenses, which is one of the reasons they are small.
Sure you can get a Leica, but have you seen how much they cost? I'm guessing not from the tone of your comment.
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