I am trying to use RRC-Nano with my IC-7100 on VHF-FM.  Unfortunately, RRC-Nano doesn't support memory channels.  And no access to settings for setting PL tones.  These are features we will one day have I hope.
In the meantime, the workaround that should work is to leave a VFO (let's say VFO B) set up for a repeater, with tone frequency and tone mode set.  The IC-7100 saves the tone information along with the other VFO settings and the tone settings survive power cycles just fine.
However, when RRC-Nano connects, it resets the TONE setting to none.  This is reproducible by simply 1. Setting a VFO with a tone via the control panel.  2. Power cycling to confirm the tone was saved.  3. Connect with RRC-Nano and immediately disconnect.  4. Power back on from the panel - the tone is disabled as a side effect of the RRC-Nano connect.
A fix would be wonderful!  Happy to do it if you'd share the source - 
Cheers,
Dave WQ1K