Local rack development shell

Feature Requests
1

I use a lot of timers in convox.yml files with a single service, scaled to 0 in production. My current development workflow to get code-syncing on gen2 is:

console1> convox start
console2> convox exec `convox ps | grep -v ^ID | head -n 1 | cut -d' ' -f1` ash
shell> ./run/test/command

It would be much simpler if I could simply run:
> convox shell [service I want to run or just first one/only in the file]
shell> ./run/test/command