Joining this conversation late:
I've given feedback on the lighting side of QLab previously, which you could summarise as:
"Here are some things you're doing differently to conventional lighting consoles, which are going to catch people out, and you might want to reconsider from the point of view of trying to get existing lighting folk to transition easily to QLab."
So I agree with a lot of the above in spirit. Having said that, it's important to always look at new ways of doing things.
My suggestion for a solution here would be to be able to have a tick box for the Instrument Definition that says something like "Allow non sequential patching". You could then have an instrument with X number of address slots, and set them accordingly. In the Light > Definitions > Parameters tab there is some space next to the Home column for a "Take From #" to get them all in sync.
Non sequential patching would also all a more conventional use of scrollers - one channel for dimmer intensity, one for colour scroll (they will never ever be sequential!) Maybe I just miss my Strand 520...
For my part, it's been a while since I gave up the practice of patching all the house lights to one desk channel. At a certain level of venue it makes perfect sense as there literally is just one channel to control, but you will increasingly get caught out. All the time I run into house light setups that need certain channels to be at certain values ("aisle downspots @ 80%, chandeliers @ 40%, wall boxes at 20%" for example), and increasingly common are LED actual fixtures as house lights, which - for right or wrong - are RGBA 4 channel affairs (times many). Yes, you can just patch the RGBA channels down to one, but the colour never looks right.
My standard approach therefore is to have a House Light submaster or playback, which is either operated manually or triggered from my main stack at the appropriate time. This means you just have one cue or look that is "house lights up", and how you get to that - might be a single channel on Friday, might be 100 fixtures on Saturday, is up to you on a venue by venue basis. I don't currently use QLab for lighting - it doesn't do what I need it to, yet - but it can certainly cope with the above: "all = cue houselightsup".
It's slightly more long winded to set up, but on difficult days it can save you a lot of time, and on easy days it's basically just as fast as mass patching to a single channel.
My unsolicited 2p!
Gareth