Could be that your "patch" is so trivial that it has been placed in a low priority queue and the maintainers will get to it when they have time! Duh!!! Get over yourself and be patient.

You are quite correct about how the 360 was named however, there never was an OS/370 or OS/380.
360,370,390 refer to the hardware architecture.
The IBM operating systems blood lines went somthing like this.

Hardware: 360 > 370 > 30xx > 43xx > 9370, 9000 > Enterprise server/Gx > z900

These are mentioned in sucession because they have the same heritage.

Operating Systems: OS/360 > OS/MFT > OS/MVT > OS/VS1 > OS/VS2 > OS/MVS > MVS/XA > MVS/ESA > OS/390 > z/OS

TOS > PCP > DOS > DOS/VS > DOS/VSE > VSE/AF > VSE/SP > VSE/ESA

VM > VM/370 > VM/SP > VM/XA > VM/ESA > z/VM