Not sure what your asking, but I hope I can get it
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A dot over a note is a staccato marking which is a detached note, and also very lightly accented, best thing to do Imo is shorten the note in the piano roll edit, and very slightly increase the volume of that note just a little (depending on the music situation, if it is a whole run of staccatos you don't want to keep increasing volume).
As for slurs there should be no volume, or velocity adjustment, just increase the note length to its maximum value, there should be no empty sound space between the notes.
When I am making volume adjustments I use the envelope feature, and use ramps if the music states a crescendo or decrescendo. I use the curve for more of a dramatic movement, usually when its not implied in the music. If I have a piece that goes from, lets say piano (p) to forte (F) I will create nodes and move directly from a lower volume to a higher volume, with no ramp or curve.
All I can say is experiment with the envelope feature. Hope this helps.
Cheers
CJ