You only need an internet connection for license activation and - every four weeks - for license renewal. Aside from this, LiveConfig does not talk with a license server. If renewal should fail (eg. because the license server is not reachable), you still have a "grace period" of one week. After that time, LiveConfig falls back to demo mode ("read only").
As long as you don't travel to mars, this should be enough for most cases.
Something like a dedicated "developer version" is not planned, this can easily be realized using a trial key. If you have special requirements, just drop us a note at support@liveconfig.com, in individual cases we can issue trial keys for longer terms (eg. 3 months).