Let's say you have the following repositories configured in ~/.mrconfig:
[src/github/owner1/projA]
...
[src/github/owner2/projB]
...
This will let you quickly switch to ~/src/github/owner1/projA:
cd (mr-utils find github projA)
If there are multiple matches, they will be printed out.
This will sort ~/.mrconfig based on sections and write it back out
mr-utils sort