As far as I can make out from the streamboard forum, pcsc interface is not supported in OSCAM, so the Omnikey reader is not supported. It seems like the Smargo is also hit and miss with few people (and this seems card and reader version dependent) managing to make it work with Smargo. The main problem seems to be to get the reader frequency set correctly and Smargo has only a few preset freq. Most success seems to have been with the Infinity serial (not US
reader.
I have tried all different configurations for the old Sly uk card, but it would not recognise the card - tried many different versions and configurations. The problem at the moment is that a newer versions of OSCAM can (and does) break cards that previously worked, so it is not just a matter of using the latest OSCAM; you have to get a version that works for your card. Currently configuration settings between versions is also not 100% stable. Newer versions require some additional parameters to try and distinguish which card is being used to ensure correct processing.
I have not tried the new sly card yet as I am wary of blowing it up, but it should be more compatible with the sly italy setup and will most likely work with the same version/condifuration as sly italy. I will try it some time when I feel brave or I am forced to make it work.