I have 12 free karma points, however game wont let me invest more than 1 point into certain attributes. How does it work?

I thought making a pistol focused character would be interesting way to play, and it was, until I did glory's side mission. Spoiler alert, you cant kill the boss with a pistol. So you either just ignore her side mission, or try raise up skill in a secondary weapon like shotgun or uzi. basically something that does way more damage. But if you do that, then why bother with pistols?...

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I have a new rigger at the start of the game. But I cannot see a way to control the Doberman drone. Clicking on the drone does nothing. I saw a post about going to the ability menus in the lower right of the screen, but nothing is there. No ability icons. The only thing on the screen is the main menu that opens from the upper left. How can I control the drone? Thanks a bunch for any help!...

I just completed the MKVI mission and sure enough I now have four equipped weapons even though my inventory screen only shows three slots. My question is, can I exploit this bug through the rest of the game? Will I lose the fourth slot if I try to equip different weapons, move guns in and out of my stash, etc? I have paid a lot of points into the ranged skill specializing in pistols and rifles. If I can keep three guns plus a deck I might put some points into shotgun but not if I am going to lose that four...