Ordering Economically but Fair to Culver's Local Owner.

I tend to order mostly standard menu items but often think up cool(to me) combinations.

Sometimes they can be ordered online but most often not, so I must order at register.

It SEEMS that how something can be "rang up" often has multiple paths.

So the QUESTION(s),

1. What is the absolute slowest time of day?

Asking with the assumption that this is the best time to ask for something a little custom.

2. I want to order something the cheapest way possible, but it is not my goal to somehow make it a loss of the store owner, or create a problem for register worker.

How does one figure out custom orders without being a train wreck of a customer?

3. I can obviously order 3 items and combine at will but this SEEMS unnecessary, knowing there are register options for much of what I want.

Would an Owner/Manager/Shift Lead spend 5 minutes with a "pretty good customer", or just find that to be a cheap customer-not worth the time?

I am a very budget conscious person, and have to watch money, BUT, I have no desire to TRICK register person into artificially cheap stuff, just the best that I can while still being fair.

Thanks!