Hello @mask_fun ,
To my knowledge, Rithmic no longer allows users to set their own risk parameters, it must be set by your broker.
As far as risk parameters set by brokers, yes, they still stay active even when the platform is shutdown or disconnected. These parameters are held on the server side.
Something to also consider is using the R Trader order screen for release/cancel orders. We also have a similar feature on Optimus Flow called scheduled orders.
This would allow the users to specify a date/time for when orders are either released or cancelled by the system. In your case, you can essentially manage your own order by configuring a release or cancellation request for 3:00pm. These orders remain on the server as well.
You can see these options in the image below: