Not sure if you are still supporting this project but in case you are it would be good to be able to supply a minimum size for the map so the user cannot resizer to a smaller size than this.
Firstly thanks for a great plugin.
I have found that if I place a map control in the bottom left position then the resize control is displayed above this control so that one cannot click on it.
On inspection I see your css has the statement z-index: 1000.
Other controls seem to be set with z-index 800
As the resize control at the bottom extends to the left and right of the map I have had to set the z-index to 750 so that the bottom left control works.
I hope this makes sense.
I don't know if my solution is a good one or could the bottom resizer be smaller in width.