You can offer "bribes" or benefits, just not punish others for not doing it.
More specifically, you can give people a choice. The IR are all about making sure that nobody has a limited gameplay experience in some core areas of the game. If you offer up an option, that's totally fine with me.
For example, some realms make it so that they say "we need more cavalry. If you want to recruit cavalry, tell the general and he'll send you gold so you can afford it." That's totally fine with me. You are not telling anyone what to recruit, but you will probably get more people recruiting cavalry this way.
