[Feature Request] Add custom weighting options

I would like to be able to override the default weighting algorithm with the ability to set static or proportional weighting of items on a wheel.

Example
Static weight option - (item 1 - 10%, Item 2- default (% based on number of items in the wheel subtracted from the other static weights), Item 3 -7%, etc..)

Proportional weight option - (item 1 - 5x the default weight, item 2 - (default based on number of items in the wheel), item 3 - 7x default weight, etc...)

No files, tests, or entry points are named in the issue. Start by locating the wheel's current weighting implementation and its item configuration UI. Done means supporting both static percentages and proportional multipliers, including default weighting for unspecified items.

Written by the indexing model from the issue text.