Thanks for the report!
Re running the IR commands in sequence - I agree we should try to fix this, It would be nice if Homey itself could support this instead of building something specific in the app. How does it work for the other IR apps? Perhaps there are some upcoming changes re this in Homey 2.0? I’ll investigate a bit. However it would be fairly easy to implement command sequences in the app which could then be triggered from a flow. Also don’t forget that you could do a flow per device and then call the device “sub flows” from a main flow.
Re the relay Yes, I think a “momentary button”-function with a configurable press duration as you suggested would be the best fit. I’ll look into this.