Tablature full notation rests and tablature aethstetic improvements

[tk5wbps2]

I'm considering contributing to lilypond. The two features I propose are as 
follows.

1) An option to include rests in tablature (with \tabFullNotation).
2) An alternative tablature full notation style that more closely resembles 
standard notation note heads and stems. To my knowledge as of version 12.13.13 
lilypond engraves tablature numbers for half notes as having two stems and half 
notes and whole notes without a circle. I propose an option for lilypond to 
engrave tablature numbers for half notes or half-note chords with a circle and 
a single stem instead of two stems. Whole notes and whole-note chords would be 
circled without a stem. In the case of multiple voices, the tablature numbers 
of each voice would be circled in the group of notes that share a stem. For 
example, this could be a set of voices that have half notes sharing a stem 
pointing up and an eighth note with a stem pointing down. Numbers corresponding 
to half notes would be circled together with an upward stem from the edge of 
the circle, and the number corresponding to the eighth note would not be 
circled or otherwise changed (except to avoid collision with the circle, see 
below). If a voice has a half note with stem pointing up and another voice has 
a half note with stem pointing down, then the two numbers would be circled 
separately, one with an upward stem starting at the edge of the first circle 
and another with a downward stem starting at the edge of the second circle. In 
scores I've seen with circled tablature numbers, collisions between numbers and 
circles are avoided by shifting numbers out of a straight vertical column, 
which I suspect is quite different than how tablature is currently handled 
internally and might require significant effort to implement, but that's just a 
guess.

Are either of these features fit for future lilypond?
Are either of these features currently present, and I've overlooked them? If 
so, would you like me to contribute documentation?
I'm only familiar with a subset of C++ up to C++03. Would my lack of knowledge 
of modern C++ exclude me from being a contributor? I'm also not an expert on UB 
in C++, although I very much want to avoid it. Would that exclude me from being 
a contributor?
If the project is interested in my contributions, we can discuss the first 
feature in more detail. I'd like to start with the first feature to get 
experience with the lilypond source. If all that goes well, then I'd consider 
specifying and working on the second feature.