There are a number of questions here on Meta asking about the list of migration sites when you vote to close a question as off-topic. The list given is quite short and people have asked repeatedly if it could be made longer.
There have been various answers given on these other questions as to why this isn't going to happen, mainly to avoid inexperienced users migrating stuff that shouldn't be migrated.
However, I have an alternative suggestion:
Can the list of migration sites be tailored to show sites that I am active in, rather than just being a fixed list.
So for example, I'm active on security.se, programmers.se, and a few others. I would like to see those sites listed, rather than tex.se and sharepoint.se, neither of which I know anything about.
I propose that the list should be adjusted to include sites where I am active. The list of default sites should only come into play if I'm not active on any other relevant SE sites.
While I agree that listing all the sites is a bad idea as discussed in other questions, I think that listing sites that I know something about should increase the effectiveness of the migration option.
It's probably best limited to sites that are likely to be relevant; ie just the tech sites for Stackoverflow -- don't bother listing the photography and cookery sites, even if I do have rep there. But other than that, I think this will significantly increase the usefulness and effectiveness of the off topic migration dialog.
Note: this question was raised as a result of a discussion in the comments on the previous question linked above. Please also see those comments.