I don't know if you can suggest new features here. I really didn't know what section to put this in.
I'm a small business at the moment who sells on eBay and I generally do everything manually for now. I would find it really useful to have a custom field option in Activity (Including balance & fees), just something I can enter whatever I want, to keep track easier of what I've done.
When it comes to busy periods it can take me a little while to find the transaction I'm starting from on that day. Having a custom field would allow me to mark where I last got up to and carry on from there. It would also make it easier to quickly find past transactions if I used the custom field to enter invoice numbers for example.
