First, need to say how much I like this site. A lot of excellent work has been and is being done: thank you!

Second, two thoughts:
1) it would be really nice to be able to create decks and folders directly from the mobile version of the site (rather than having to switch to the desktop version, create the deck, and then switch back).

2) it would also be nice to be able to access the deck tags, the curve and pie chart information, and the statistics/sample hand page from the mobile version.

Are there any plans to expand mobile functionality this way?

Yep, definitely want to improve the mobile interface! Time is always scarce though and I get to things slowly sometimes. But definitely on the list.

This is great to hear! Keep up the awesome work.