I'm in your target market, but I do not have any need for the features you're offering. Have you worked with independent software developers to identify the need you're satisfying with your product? For my own case, at least, it's not that we've not the time or inclination to create detailed timelines or project plans, it's that we would find such things less than useless since we're frequently changing plans to better satisfy emerging user requirements.

To use a tortured analogy, large companies are like container ships plodding along a pre-defined course [they know exactly where they're going to be four weeks from now] whereas smaller developers are on the scale of Leif Erickson [we're headed 'thataway', hope to find something really valuable in the process, but realize we're going to have to change course every day to adapt to the winds, current and coastline we're discovering if we've any hope of surviving this adventure]. If you're enabling large-company planning processes for independent developers, there may be a mis-match in your marketing.

If you've not yet sat down with some small software companies to find out just what they would find helpful, I'd suggest you do so before proceeding further. You don't want to find yourself creating the perfect product for a non-existent need -- that way leads to madness.