Custom Bar Numbering Capabilities

I work in musical theatre and oftentimes we use custom bar numbering when we insert bars in music. For example, if I wanted to insert 2 bars between bar 41 and 42, I would label them 41, 41A, 41B, 42.
There are workarounds, but these often can be problematic. Ideally, an overall "bar number matrix" or just an extended menu in bar properties for each bar would be nice. In addition, the ability to add an arrow before a bar number jump would be nice, i.e. if we cut from bar 41 to bar 50, we may right 41, (to 50), -> 50.