If you can help or wish to become one of the maintainers - just start helping. You can find more RVM related projects at RVM Github organization.
If you do not want to use gemsets and want to ignore them you can use command line flag `--ignore-gemsets`:
rvm use 1.9.3@my_project --ignore-gemsets
it will ignore @my_project and @global, only default gemset will be set.
It can be done persistent with:
echo "export rvm_ignore_gemsets_flag=1" >> ~/.rvmrc