It would be useful to have a central granular conveyance trench beneath permeable paving to avoid the need for overly deep sub base beneath the road / drive.

The sizing calculator in the pond build pop-up enables one side lpe only.
There are now LLFAs that require level benck of at aleast 1.5 m width after 0.6 m depth in a basin.
It is currently not possible to use your calculator to establish such basin properties.
This would be useful.

It would be good to have an option in underground stormwater controls to have a separate option for exceedance level and Ground Level
By taking the exceedance level as GL, it makes the Long sections look distorted when in reality it is common for our designs to have circa. 1m+ cover from top of tanks/soakaways etc to ground level.

It would be very useful if there was a way for the true ground profile to also be exported on long sections. Currently, when exporting long sections from microdrainage, the true ground levels are only shown at manhole locations and a straight line is used to replicate ground level between the manholes. Could a 3D terrrain file possibly be loaded into microdrainage so that the true ground profile is shown when exporting long sections?

Add Tree Pits as a type of SuDS structure.

Would be useful to be able to 'replace outline' of a stormwater control by importing a polygon (e.g. DXF, SHP etc), rather than the existing options which are just to redraw in ID only.
Every project there seems to be need to replace an outline from another drawing (as architechtural desisns evolve). At teh moment have to re-set up the control each time this occurs.

Te has specific meaning in the UK when using the rational method (modified).
Tc also has speific meaning (Te + sumTf).
It would be better if the software wants the user to input a Te, that it calls it Te. At the moment it calls the Te Time of concentration, which is very confusing.

when I start a new network, the criteria automatically selects my default manhole and pipe size file, can you change it so when importing a file for the first time it selects my standard default files, older versions did select the default file

to be able to change the default button in storm duration so I can set up my own default settings

Can wall thicknesses be added to pipes and manholes to check clash detections

The status bar currently only displays levels (ground model level, water depth) to 1 decimal place. 2 Decimal places would be much more useful, Especially to ensure a node is at a low point or in the gutter invert..

When running the simulation wizard I would like to be able to run the same return period with multiple climate change allowances to enable a single analysis covering all scenarios. This will avoid needing to adjust inputs & rerunning the network multiple times to cover no CC, upper & lower CC limits.

Enable the manholes assigned to impermeable areas on drawnet to be changed.
It is currently not possible to change the manhole when editing a network meaning the areas have to be deleted then recreated. Being able to change the manhole would save a lot of time.

I would like to be able to build a single cascade model & able run it for various design return periods instead of needing to create separate cascade models for each return period.

Support a wider range of linear drainage channels.