This is possible with the current version of my plugin, which I'll release in the next weeks. If you can't wait, here is the source code:

Code:

---

DLLFUNC var DllSearchFolder(STRING* title,STRING* str1,STRING* str2)
{
    BROWSEINFO brinfo;
	char buffer[MAX_PATH];
	char buffer2[MAX_PATH];
	int Image = NULL;
	ITEMIDLIST* iteminfo;

	brinfo.hwndOwner = ev->hWnd;
	brinfo.pidlRoot = NULL;
	brinfo.pszDisplayName = buffer;
	brinfo.lpszTitle = title->chars;
	brinfo.ulFlags = NULL;
	brinfo.lpfn = NULL;
	brinfo.lParam = NULL;
	brinfo.iImage = Image;

	iteminfo = SHBrowseForFolder(&brinfo);
	if(!iteminfo) { return(_VAR(0)); }

	SHGetPathFromIDList(iteminfo,buffer2);

	if(str1 != 0)
	{
		strncpy(str1->chars,buffer,MAX_PATH);
	}
	else
	{
		DllStringSend1(buffer);
	}
	if(str2 != 0)
	{
		strncpy(str2->chars,buffer2,MAX_PATH);
	}
	else
	{	
		DllStringSend2(buffer2);
	}

	return(_VAR(1));
}

---