Congrats on getting such early feedback and vetting. In fact hearing your story about an internal award/competition just added +1 to Intuit's cool points in my books.
Every company with developers should be in the business of productivity tools for their devs. Even if there may never be a real money-making business there, those tools can be contributed to the open source ecosystem.
It sounds as if CompanyLine was the product "you really needed at your previous employer". This is exactly what PG recommends for startup ideas. Good luck!