issue relations network view
Redmine has a very form based (flat) view on issue and work task managemnt what is very liek standard web based application and based on model relations one step beyond every enitity.
For real there is a wide spread network ad graph of dependecnies and relations of issues which shall be visualized and browsable in a more intuitive way. Just compare excel bases brain storming with a mind map.
Such "mind map" visualization would be useful for redmine also, although i think it is ok to be readonly in the first thorw with shortcuts to existing for based edit masks.
A picture says more than 100 words, so see below my picture how such a network/graph could look like. It makes dependencies much clear because you can look x step beyond the issue you goonn change. A nice idea would be able to configure the amout of "issue hops" to traverse in the direction you can filter by issue relation typ.