#3 Display custom OID in graph

[MrFlibble]

Hello,
This program is great, thank you for writing it!

I was wondering if it would be possible to display the custom SNMP OIDs that you can configure in the graph.
Even though I've got a custom OID configured (and enabled) under Source->SNMP->OIDs, I can't select it to be displayed on the graph.
I could change the "Download" OID to the counter I want to display, but I don't seem to be able to set the scale (maximum xxx kbit/s) properly (I guess because the counter in question doesn't reset after being read?)
Is there anything I can do to display this properly?

Thank you!