I've searched the Idea Station but didn't find something quite like this with replace (although I did find a lot of requests to change the replace functionality)
When replacing a component, the only options available are "Replace" and "Replace all". This can be troublesome when trying to replace only a few items and not all of them e.g. 4 out of 8 dowels.
So to illustrate here is an example:
If you want to replace 4 out of 8 dowels you will have to repeat the "Replace" operation 4 times, as "Replace all" would obviously replace all 8.
If there was the option of “Replace selected”, you could have selected the 4 dowels and replaced them in 1 step.
This is an efficiency enhancement that would make many designers lives much easier!