Two suggestions for upcoming updates.
Import / export option to mark or unmark everything. I have more than 100 box click to select, it is very heavy. Sometimes it is better to select everything and disregard what you do not want.
In the COIN tab, a search engine to filter results, sometimes I look for a coin to see its price or reward, but since we already have so many coins I have to look visually, something like what you already have done in the Pools. It would make life easier
Both the Import and Export dialogs already have buttons for select all / none. Is it per a group of items in this dialog, for example External Miners and Managed Miners, you want this feature as well?
Good suggestion on the Coins tab. I will make another small change to the coins list in the next update, where you can press for example 'L' to jump to the next coin in list with a name starting with L. This should make it a bit faster to find a specific coin as the list is getting longer these days.