You need to set the path to the directory "splash_v1" in plugin "com.project.console". Example without directory "splash_v1":
osgi.splashPath=platform:/base/plugins/com.project.console
If you are asking how to define launch parameters when starting up your RCP application you have two options.
./myrcp -application myrcp
).For an overview of runtime options, cf. The Eclipse runtime options.