For example, let's say I have a Linx plugged into a designated max machine. Instead of dialing *99 on my fax machine first, it would be nice to specify that prefix on my.ooma.com so any outbound calls from that particular Linx dial *99 automatically. The same concept applies for a Linx that will always function on a designated line - let's say I have a Linx that is always supposed to be dialing on the second line (maybe an alarm system), so it has **1 saved as a prefix and thus always uses Line 2.
If this is possible in the current setup and I've missed something, I'd love to know how to do it. If not, this feature makes a lot of sense to me.