As a Dropbox employee, both of these things have been super useful, especially being able to share sets of pictures without shuffling them around into shared folders. Glad they're shipping to everyone now :)
Whilst this is another great addition to dropbox, their pricing is still not competitive. I love dropbox. It's simple, does what it says on the tin, and the recent addition of automatic camera uploads made me switch.
I wish Dropbox would come out with client-side encryption. They have had a couple of serious breaches and I frankly don't trust them with anything important.
(Edit): I am aware there are methods to do it yourself - they are all too cumbersome. I want something simple and built into the client.
I feel they are late in introducing this feature...I was a DropBox user since beginning and collected 10GB more freespace by invites .
Recently slowly i have shifted my alliances to Skydrive after giving a try on Google Drive. Althgh am one of the Microsoft hating club, Skydrive is so fast and happy with its services. Only worry for me on Skydrive is Microsoft's history of scrapping the project even when its successful. Hopefully they don't do it.
I was a Microsoft Live Mesh user. After the idiotic decision to shut that down in favor of SkyDrive, I decided to just drop Microsoft completely. I had been using Dropbox and Mesh side-by-side. Mesh was unique for syncing files and folders in place, without having to move them to a new place.
Overall I always found Dropbox to be faster and more reliable.
Their target audience is non-expert consumers. These new features are perfect examples of what their target audience wants. Any feature that requires editing a configuration file will probably never be implemented.
Ok, then don't make it configurable through a configuration file. This feature (the ability to ignore certain files or filetypes) could be configured similarly to how Dropbox currently handles selective sync.