Fingering Substitution Arc Below with MScoreBC
Tucked away within MuseScore is the font entitled MScoreBC. This font has the Old-Style numerals that are often found in older professional scores for page numbers and fingerings. They're also found in fonts like Bravura, Emm. etc with the distinction that Bravura & Emm have a huge spacing below them (which works fine for page numbers but not for fingerings or text with numbers of course).
This suggestion here is a mentioning of the fact that this type of font is very prominent in finger-text. Because of this, it makes sense to utilize it for that purpose. And now to the point.
The Special Characters dialogue is used for the Finger-Replacement symbol of the slur-like character for above and below (arc above/below). This works just fine, but if MScoreBC is utilized, the arc below will be too close to the numerals by a few points. The arc above works just fine though.
Here's a screenshot:
And although this might not be something that can be important to most, if there's anyway the MScoreBC font, or the way it is dealt with in this situation could be updated in some fashion to allow for that [arc below] to be spaced well, it would be worth doing. Of course it's something minor and not on the main hit-list, but it definitely wouldn't hurt to some how fix this, and it is worth at least an issue tracker post to keep a tab on it on the side.
P.S. More information about fingering-melismas/slurs are found in an older discussion at [https://musescore.org/en/node/61721]