If I run qbs run but there are multiple products I get this warning:

ERROR: Ambiguous use of command 'run': No product given for project with more than one product.

Followed by a screen-long usage help.

Maybe it would be handy to remove the screen-long usage help (i got the right command afterall) and advertise the -p parameter directly.
Ideally a list of all runnable products could be shown too (but I do not know wether it is possible to determinate wether a product is 'runnable')

Regards,
Erik