Took longer than expected to reply, but I became rather stretched with the recent developments. Let's see if it was such a good idea to get into the client GUI software in full.
But that I will know somewhat later, when the setting up and fixes are done. Anyway, I would expect to have even less time to code for modRana specifically.
I have implemented the search along the route for WhoGo using the current road only. So, its active only if there is a road available.
As for limitations, OSM Scout Server searches the full road with the search optionally from some position. Imagine driving along road and looking for upcoming gas stations. So, some options are needed to be specified.
To me, it looks like an additional Search on modRana Search screen, next to Local and Wikipedia.
As for options, you would probably want to add some options for Local search as well, to get support for specifying type and name in OSM Scout Server options.
Probably also distance from current location or road. There are not that many options, so, screen can be shared with the results, but still some.