Hi,
We don’t invest into supporting Atmel devices because they have their own Visual Studio-based IDE (Atmel Studio). If there are third-party tools supporting DragonLink with GDB (i.e. implementing gdbserver), you could easily plug them in. Let us know if you need more details.
You can always upgrade VisualGDB to a higher edition. However, the upgrade price depends on the time of upgrade. E.g. if you upgrade within the first month it’s just the price difference and if you want upgrade after the support/update year ends, you would need to pay the full price again.