Lots of us have been using the 3way zwave switches for years. GE, Evolve, etc.
Do you have a really old hardware version of the 2GIG panel, with the older 2.78 zwave version (does your emergency button say “Emergency” or does it have three symbols)?
Just to be clear, I am referring to the switches where one has a dimmer on switch and then there is another switch that just turns it off and on and both switches control the same lights.
I am talking about 3-way zwave GE/Jasco switches that also dim… I don’t actually use the dimmers myself (I use the regular GE/Jasco zwave 3way switches), but others do, and you can get the GE zwave 3way dimmer from Lowes for like $40 (iris aisle).
Here is some info on the best 3way dimmers for 2GIG if you have LED and CFL (I use the GE/Jasco 3way with CFL, but the 3way GE dimmers are not recommended for LED):
For Zwave 3 Way circuits where a slave transmitter is used, you will need a controller with an associate function. We typically recommend using the minimote. Can be just learned into the 2GIG panel then used as a scene controller and to associate 3 way transmitters with the primary load switch.
Just as a FYI, if you have low voltage lighting (typically what MR-16 bulbs are plugged into) you need to identify if you have an electronic or magnetic transformer. Then you have to get a matching magnetic or electronic low voltage z-wave switch. The only company I have found that makes these are Leviton. The “universal” switches you see everywhere are not designed for low voltage applications.