No additions from me unfortunately but some comments on above mentioned games may assist.(posted 9284 days ago)Truxton has not even been finished with default settings on MARP so shouldn't be classified as marathonable yet since it isn't currently a victim of abuse.
Gradius & Lifeforce have a bonus life dip switch setting that can be set to only 1 life severely limiting ability to marathon.
I'm assuming everyone noted that QT only wants a list of games marathonable at the HARDEST difficulty conditions, not just on default.
Now I suppose Hisa-Chan will now prove me wrong by producing inp's of all the above games being clocked ad infinitum :-)