What do you want to customize it to? Note this thread for the Alt key:
Ok that's new. I was using the apprentice 12.1. Now I downloaded the 12.5 and give it a try
Also changing my vieports with spacebar+b, it feels like trying to write with my left hand.
This is customizable. First make sure you're in the View tool, right-mouse and then hold Ctrl+Alt+Shift+left click on the Toggle Single/Quad menu entry (last item). Alternatively, just search for the hotkey “b” in the Hotkey Manager.
I know that this is customizable and my wish is probably just worded wrong. I just don't like that viewtool. It's true that you can change the shortcut B to let's say A or so but that doesn't change that I always have to press spacebar+A. I always have to temporarly change to the viewtool and that is what feels so unnatural. I have worked with Cinema 4D before and now I use Maya. No 3D software ever needed a viewtool so why does Houdini. Even if I can change the viewtool to the ALT key for example, I would always have to press ALT+B or ALT+A or ALT+anykey.
Try turning on dependency links in the network display options. To get at the network display options, it's the right-most icon in the Network View pane's toolbar.
Yes, but it is limited because it only workes inside one network editor, an expression that connects nodes in different network editors is still not visible. That brings me to a wish that I didn't mentioned before. A dream would come true if Houdini could be designed to have everything working in in one network, well actually two, like Nuke. Imagine there would be different networks for keying, rotoscoping, 3D, color corrections and so on. Nuke wouldn't be, where it is right now.
Having just one network editor would open two doors:
1. All dependency links would be visible and you very easy can see what is going on
2. now you can integrate expression nodes (like mathops or a code node) that you can insert into that dependency link, so you can create expressions with nodes. This way you can make use of expressions without coding (useful for lazy people and people who don't know much about coding).