Edwinna,
I think your first tracker issue is the same as what I posted. Basically asking to be able to enter real numbers as the grade cutoff in the Grade Letters settings.
As for the second one - take a look at: http://server3.moodle.com/browse/MDL-6226 which also looks similar.
Lael
Gradebook
Rounding Up Final Grades in 1.9.4+
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