Yes, coin selection is supported.
In the desktop Qt GUI, go to menubar>View>Addresses, and also menubar>View>Coins.
The Coins tab is better suited for this, where you can right-click an individual coin (utxo) and select "Add to coin control" (or "Remove from coin control").
There is similar functionality in the Addresses tab too.

Also, from the same right-click context menus, you can "Freeze"/"Unfreeze" addresses/coins, which is sort of the inverse operation (except freezing is persisted in the wallet file, so it will be remembered even if you close the application and reopen it later).