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>  Could you add a shift click for grabbing multiple tiles?

Done.  Well, I went with simply click-drag to select a range of tiles.  Let me know how it works for you, I thought it was slightly easier and more intuitive than a shift-click approach.

> I just tested it out a little, it seems to be a bug tied to the tile swap, since it works before I swap tiles but not after.

Did some testing, and I think this is the 'Window sometimes doesn't respond to clicks on title bar or window frame' issue that all my apps seems to have.  I hate to point fingers, but I think it's something in SDL library that I use for display.  I don't know what it is but it seems to get confused about whether the window is active or not.  At some point I hope to do a deep-dive and figure out what is going on and hash out a solution.

In the meant time, try clicking off the window and then very specifically clicking back on the title bar area.  That's usually enough to kick it back it shape for a bit.