Styling symbols - dx and dy attribute

Hi,

Would that be possible to add these attributes to this list?

dx

dy

symbol

• src
• scale
• scale-icon-size
• symbol-width
• symbol-height
• priority
• force-draw

At least dx would be great. That would give an option to display multiple hiking symbols on ways which contain multiple hiking trails. Similar to Waymarked trails :

http://hiking.waymarkedtrails.org/pl/?zoom=17&lat=54.42682&lon=18.5288&hill=0.5&route=1

Here you can see 3 different symbols on one track, I guess that "dx" attribute is used in this case.

Thanks a lot in advance!

Best regards,