I don’t know why, but the NLA will not snap to frames. I have selected snap to frames in the NLA and I am using the CTRL-Key when I drag keys, but, sure enough, the little read out shows me delta key frame values with mantissa.
If you used the “Frame Step” option to snap the strips using Ctrl will give you “finer” control, i.e. values lower then a full frame … If you use the “Nearest Frame” then it will always snap in full frame increments with or without Ctrl . Same thing with “Nearest Marker” …