It is possible to get a greyscale using a pretty wide variety of developers, but the film still has a relatively short scale. There is no way around that. So all I'm saying is I would not recommend it for general photography (which I think is what OP was asking about) unless working under limited contrast conditions or contolled lighting situations, or if special effects are desired. Other key considerations regarding general photography:
1. Tech Pan's extended red sensitivity makes it a tricky film to meter for under different lighting conditions. Establishing a standard EI is difficult as speed falls off pretty quickly under more bluish lighting (ie typical outdoor shadows)
2. The standard zone system placements (ie speed point .1 above base fog and shadows on zone III) need to be adjusted downward if one wants to make maximum use of the available scale. This applies to all document films as you cannot afford to "waste" any density on the low end. This is where different developers can have substantially different effects. If a developer gives higher toe contrast, very low densities can be used as part of the printable scale. There's some good discussion about this in The Film Development Cookbook.
3. Reportedy batch to batch variations were more significant with Tech Pan than other films, which can further complicate exposure/development.
..and to summarize on your very good points..it is very rarely worth all the trouble