NOTE: This suggestion is for JIRA Server. Using JIRA Cloud? See the corresponding suggestion.
Having a way to control visibility, display order, and usage for Issue links would be great as well.
"Issue Link" Sort
sort the issue link in the issue drop down menu with the alphabet order
Customise Issue Links per project
Ability to sort projects in order other than alphabetical
Allow to sort / customise the order of Issue Links
Allow administrators to sort the issue link type list